Power Door Locks Malfunction
Power Door Locks Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
When any of the door lock switches are placed in the lock position, a ground signal is applied to the BCM through the door lock signal circuit. Upon receiving this signal, the BCM grounds the control side of the door lock relay through the door lock relay control circuit. Since the other side of the door lock relay coil is connected to battery voltage, the relay is energized. This causes the contacts to close and complete the path from the battery voltage circuit. Voltage is then applied to the lock side of the door lock actuators through the door lock actuator lock circuits. Since the other side of the all the door lock actuators are connected to the normally closed contacts of their respective unlock relays to ground, the doors lock.
Diagnostic Aids
Verify the smooth and consistent mechanical operation of each part of the door latch system prior to performing extensive electrical diagnostics
Any door that does not function smoothly or consistently, refer to Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Driver Door Lock Sw and Driver Door Unlock Sw parameters while using the driver door lock switch. The parameter should change from Inactive to Active.
• If either value is always Active or always Active, refer to Driver Door Lock Switch Malfunction.
2. Observe the scan tool Psgr Door Lock Sw and Psgr Door Unlock Sw parameters when pushing the appropriate switch on the passenger door lock switch. The value should be Inactive and change to Active.
• If either value is always Inactive, refer to Passenger Door Lock Switch Malfunction.
• If the value changes from Inactive to Active for the lock switch only, refer to Passenger Door Lock Switch Malfunction.
• If the value changes from Inactive to Active for the unlock switch only, refer to Passenger Door Lock Switch Malfunction.
• If a value is always Active, refer to Lock and Unlock Circuit Test.
3. Observe the scan tool Psgr Door Lock Sw and Psgr Door Unlock Sw parameters when pushing the appropriate switch on the cargo door lock switch. The value should be Inactive and change to Active.
• If either value is always Inactive, refer to Cargo Door Lock Switch Malfunction.
• If the value changes from Inactive to Active for the lock switch only, refer to Cargo Door Lock Switch Malfunction.
• If the value changes from Inactive to Active for the unlock switch only, refer to Cargo Door Lock Switch Malfunction.
• If a value is always Active, refer to Lock and Unlock Circuit Test.
4. Verify the function of the driver, passenger and rear door lock knobs by manually moving the door locks knobs between the LOCK and UNLOCK positions, all door lock knobs should move between the LOCK and UNLOCK positions without binding or require excessive force.
• If the driver, passenger or rear door lock knob does not function or requires excessive force, refer to Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function.
5. Command the door latches to LOCK and UNLOCK by using the door lock switch, all doors should perform LOCK and UNLOCK function.
• If one or more but not all door latches do not LOCK or UNLOCK, refer to Driver/Passenger/Cargo Door Lock Malfunction.
• If a sliding door lock actuator does not LOCK or UNLOCK, refer to Sliding Door Lock Malfunction.
• If all doors do not LOCK or UNLOCK, refer to Body Fuse Block Test.
Circuit/System Testing
Driver Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the driver door lock switch.
2. Test for less than 10 ohms between the ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Driver Door Lock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the body control module.
4. Install a 3A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool Driver Door Unlock Sw parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
5. Verify the scan tool Driver Door Unlock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal G for a short to ground. If the circuit tests normal, replace the body control module.
6. Install a 3A fused jumper wire between the signal circuit terminal G and ground. Verify the scan tool Driver Door Lock Sw parameter is Active
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
7. If all circuits test normal, test or replace the driver door lock switch.
Passenger Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the door lock switch-passenger.
2. Test for less than 10 ohms between the ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for greater than 10 V between the control circuit terminal listed below and ground:
* Control circuit terminal G
* Control circuit terminal F
• If less than the specified range, test the control circuit for an open/high resistance.
4. If all circuits test normal, test or replace the door lock switch-passenger.
Cargo Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the door lock switch-cargo.
2. Test for less than 10 ohms between the ground circuit terminal E and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for greater than 10 V between the control circuit terminal listed below and ground:
* Control circuit terminal A
* Control circuit terminal D
• If less than the specified range, test the control circuit for an open/high resistance.
4. If all circuits test normal, test or replace the door lock switch-cargo.
Lock and Unlock Circuit Test
1. Ignition OFF, disconnect the harness connector at the door lock switch-passenger.
2. Disconnect the harness connector at the door lock switch-cargo.
3. Ignition ON, verify that the scan tool Psgr Door Lock Sw parameter is Inactive.
• If the value is Active, test the signal circuit terminals listed below for a short to ground. If the circuits test normal, replace the body control module.
* Signal circuit terminal G - door lock switch-passenger
* Signal circuit terminal A - door lock switch-cargo
4. Verify that the scan tool Psgr Door Unlock Sw parameter is Inactive.
• If the value is Active, test the signal circuit terminals listed below for a short to ground. If the circuits test normal, replace the body control module.
* Signal circuit terminal F - door lock switch-passenger
* Signal circuit terminal D - door lock switch-cargo
5. Connect the harness connector at the door lock switch-cargo.
6. Observe the scan tool Psgr Door Lock Sw and Psgr Door Unlock Sw parameters while using the door lock switch-passenger. The parameters should change from Inactive to Active.
• If a value is always Active, replace the door lock switch-passenger.
7. Connect the harness connector at the door lock switch-cargo.
8. Observe the scan tool Psgr Door Lock Sw and Psgr Door Unlock Sw parameters while using the door lock switch-cargo. The parameters should change from Inactive to Active.
• If the value is always Lock or always Unlock, test or replace the door lock switch-cargo.
9. If all circuits test normal, replace the body control module.
Driver/Passenger/Cargo Door Lock Malfunction
1. Ignition OFF, verify the harness connector for the appropriate door latch is firmly seated and secure.
• If not the specified condition, seat and secure the harness connector and perform the Circuit/System Verification.
2. If the harness connector for the door latch is firmly seated and secure, refer to Driver/Passenger/Cargo Door Lock Circuit Testing.
Driver/Passenger/Cargo Door Lock Circuit Testing
1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Ignition ON, connect a test lamp between the control circuit terminal A and control circuit terminal B.
3. Command the door to LOCK and UNLOCK with a scan tool. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp does not illuminate during either of the commands and the circuit fuse is open, test either control circuit for a short to ground. If the circuits test normal, test or replace the door latch.
• If the test lamp does not illuminate during either of the commands and the circuit fuse is normal, test either control circuit for an open/high resistance. If the circuits test normal, refer to Body Fuse Block Test.
4. If all circuits test normal, test or replace the rear door latch.
Body Fuse Block Test
1. Ignition OFF, disconnect the X1 harness connector at the body fuse block.
2. Test for less than 10 ohms between the ground circuit terminal 22 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 11 and B+
4. Ignition ON, command the doors to UNLOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the UNLOCK state.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the body control module.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
5. Connect a test lamp between the control circuit terminal 18 and B+.
6. Command the doors to UNLOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the UNLOCK state.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the body control module.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
7. Connect a test lamp between the control circuit terminal 5 and ground.
8. Command the doors to LOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the LOCK state.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the body control module.
• If the test lamp is always OFF, test the control circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the body control module.
9. Connect a test lamp between the control circuit terminal 19 and ground.
10. Command the doors to LOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the LOCK state.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the body control module.
• If the test lamp is always OFF, test the control circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the body control module.
11. If all circuits test normal, replace the body fuse block.
Sliding Door Lock Malfunction
1. Ignition OFF, verify the appropriate harness connector for the sliding door latch is firmly seated and secure.
• If not the specified condition, seat and secure the harness connector and perform the Circuit/System Verification.
2. If the harness connector for the rear door latch is firmly seated and secure, refer to Sliding Door Lock Circuit Testing.
Sliding Door Lock Circuit Testing
1. Ignition OFF, disconnect the harness connector at the appropriate door contact plate.
2. Test for less than 1 ohms between the control circuit terminal B and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
3. Test for less than 1 ohms between the control circuit terminal A and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
4. Connect a test lamp between control circuit terminal B and control circuit terminal A.
5. Ignition ON, command the rear doors to LOCK and UNLOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuit tests normal, replace the body fuse block.
6. Ignition OFF, connect the harness connector at the door contact plate. Close the sliding door and disconnect the harness connector at the rear door lock actuator.
7. Test for less than 1 ohms between the control circuit terminal B and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the door contact plate.
8. Test for less than 1 ohms between the control circuit terminal A and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the door contact plate.
9. Connect a test lamp between control circuit terminal B and control circuit terminal A.
10. Ignition ON, command the rear doors to LOCK and UNLOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp remains OFF during either of the commands, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the door contact plate.
11. If all circuits test normal, test or replace the rear door lock actuator.
Component Testing
Door Lock Switch Test
1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for infinite resistance between the signal terminals and the ground terminal listed below with the switch in the inactive position:
* Driver door lock switch terminal F and A
* Driver door lock switch terminal G and A
* Passenger door lock switch terminal F and A
* Passenger door lock switch terminal G and A
* Rear cargo door lock switch terminal A and E
* Rear cargo door lock switch terminal D and E
• If less than the specified value, replace the door lock switch.
3. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the lock position:
* Driver door lock switch terminal F and A
* Passenger door lock switch terminal F and A
* Rear cargo door lock switch terminal A and E
• If greater than the specified value, replace the door lock switch.
4. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the unlock position:
* Driver door lock switch terminal G and A
* Passenger door lock switch terminal G and A
* Rear cargo door lock switch terminal D and E
• If greater than the specified value, replace the door lock switch.
Door Lock Actuator Test
1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Install a 15A fused jumper wire between one of the control terminals and 12V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the door latch should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the door latch
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Side Door Window Module Replacement Service and Repair
* Rear Door Lock Replacement Rear Door Lock Replacement
* Body Wiring Harness Junction Block Replacement Body Wiring Harness Junction Block Replacement
* Door Lock Switch Replacement Service and Repair
* Door Lock Harness Contact Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming