Power Door Locks Malfunction (RPO AU3 Without AN3/DL3)
Power Door Locks Malfunction (RPO AU3 Without AN3/DL3)
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
The power door locks are controlled by the body control module (BCM) through lock and unlock printed circuit board relays in the I/P fuse block. The driver and passenger door lock switches are normally open, 2 position rocker type switches, with detents for lock and unlock. The lock and unlock switch signal circuits are referenced from battery voltage by the BCM and when a door lock or unlock switch is pressed the signal circuit is closed to ground through the switch contacts and BCM determines the signal is active. The unlock relays are controlled by the BCM through driver door and passenger door low side drive control circuits and the lock relays are controlled through a single high side drive control circuit. During lock or unlock operation, battery voltage will be supplied to the lock actuators through the energized relays and grounded through the de-energized relays.
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 Unlock Sw. and Driver Door Lock Sw. parameters while using the driver door lock switch. The parameter should change from Inactive to Active.
• If the value does not change, refer to Door Lock Switch Malfunction.
2. Observe the scan tool Psgr Door Unlock Sw. and Psgr Door Lock Sw. parameters while using the passenger door lock switch. The parameter should change from Inactive to Active.
• If the value does not change, refer to Door Lock Switch Malfunction.
3. Verify the function of the driver and passenger 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 a 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.
4. Command the doors to LOCK and UNLOCK with a scan tool, all doors should perform the LOCK and UNLOCK function.
• If one or more doors do not LOCK or UNLOCK, refer to Door Lock Malfunction.
Circuit/System Testing
Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for less than 10 ohms between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Door Unlock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
* With YE9 driver door lock switch terminal D
* Without YE9 driver door lock switch terminal E
* With YE9 passenger door lock switch terminal D
* Without YE9 passenger door lock switch terminal E
4. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Door Unlock Sw parameter is Active.
* With YE9 driver door lock switch terminal D
* Without YE9 driver door lock switch terminal E
* With YE9 passenger door lock switch terminal D
* Without YE9 passenger door lock switch terminal E
• 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 BCM.
5. Verify the scan tool Door Lock Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM
* Without YE9 driver door lock switch terminal D
* With YE9 driver door lock switch terminal E
* Without YE9 passenger door lock switch terminal D
* With YE9 passenger door lock switch terminal E
6. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Door Lock Sw parameter is Active.
* Without YE9 driver door lock switch terminal D
* With YE9 driver door lock switch terminal E
* Without YE9 passenger door lock switch terminal D
* With YE9 passenger door lock switch terminal E
• 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 BCM.
7. If all circuits test normal, test or replace the door lock switch.
Door Lock Malfunction
Note:
Verify the connector for the appropriate door latch is firmly seated.
1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Ignition ON, connect a test lamp between the control circuit terminals listed below:
* Terminal 2 and terminal 3 - driver door latch
* Terminal 5 and terminal 6 - passenger door latch
* Terminal 2 and terminal 3 - left rear door latch
* Terminal 5 and terminal 6 - right rear door latch
3. Command the doors 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 good, test either control circuit for an open/high resistance. If the circuits test normal, refer to I/P Fuse Block Test.
4. If all circuits test normal, test or replace the door latch.
I/P Fuse Block Test
1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
2. Test for less than 1 ohms between the ground circuit terminal E1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect the X1 harness connector at the I/P fuse block.
4. Disconnect the X2 harness connector and the X3 harness connector at the I/P fuse block.
5. Connect a test lamp between the control circuit terminal listed below and B+
* Control circuit terminal A2 X2 - with YE9
* Control circuit terminal A2 X3 - without YE9
* Control circuit terminal A3 X3
6. Ignition ON, command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
• 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 BCM.
7. Connect a test lamp between the control circuit terminal listed below and ground:
* Control circuit terminal A2 X3 - with YE9
* Control circuit terminal A2 X2 - without YE9
8. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• 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 BCM.
9. If all circuits test normal, replace the I/P fuse block.
Component Testing
Door Lock Switch
1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for infinite resistance between the signal terminals D and E and the ground terminal B with the switch in the open position.
• If not the specified value, replace the door lock switch.
3. Test for less than 2 ohms between the signal terminal D and the ground terminal B with the switch in the LOCK or UNLOCK position.
• If greater than the specified range, replace the door lock switch.
4. Test for less than 2 ohms between the signal terminal E and the ground terminal B with the switch in the LOCK or UNLOCK position.
• If greater than the specified range, replace the door lock switch.
Door Lock
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.
* Door Lock Switch Replacement - Front (with DL8 and without SLT) Door Lock Switch Replacement - Front (with DL8 and without SLT)
* Door Lock and Side Window Switch Replacement - Driver Side Door Lock and Side Window Switch Replacement - Driver Side
* Door Lock and Side Window Switch Replacement - Passenger Side Door Lock and Side Window Switch Replacement - Passenger Side
* Rear Side Door Lock Replacement (Extended Cab Upper) Rear Side Door Lock Replacement (Extended Cab Upper)Rear Side Door Lock Replacement (Crew Cab) Rear Side Door Lock Replacement (Crew Cab)Rear Side Door Lock Replacement (Extended Cab Lower) Rear Side Door Lock Replacement (Extended Cab Lower)
* Front Side Door Lock Replacement Front Side Door Lock Replacement
* Instrument Panel Electrical Center or Junction Block Replacement - Left Side Instrument Panel Electrical Center or Junction Block Replacement - Left Side
* Control Module References Control Module References for BCM replacement, setup, and programming