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 IP 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.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics (Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
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 (Programming and Relearning) 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. 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 30 ohm 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
1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
2. Test for less than 30 ohm 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 and disconnect the X2 and X3 harness connectors.
4. Connect a test lamp between the control circuit terminal listed below and ground:
* X2 harness connector, control circuit terminal A3 (Without YE9)
* X3 harness connector, control circuit terminal A2 (With YE9)
5. Ignition ON, command the doors to LOCK with a scan tool, the test lamp should illuminate during the LOCK command.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM
6. Connect a test lamp between the X3 harness connector control circuit terminal A3 and B+.
7. Command the doors to UNLOCK with a scan tool, the test lamp should illuminate during the UNLOCK command.
• 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.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM
8. Connect a test lamp between the control circuit terminal listed below and B+:
* X3 harness connector, control circuit terminal A2 (Without YE9)
* X2 harness connector, control circuit terminal A2 (With YE9)
9. Command the doors to UNLOCK by using the driver door lock switch, the test lamp should illuminate during the UNLOCK command.
• 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.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
10. Ignition OFF, connect the X2 and X3 harness connectors at the I/P fuse block and disconnect the appropriate door latch
11. Test for less than 30 ohm between the control circuit terminal listed below and ground:
* Control circuit terminal 2
* Control circuit terminal 3
* Control circuit terminal 5
* Control circuit terminal 6
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the I/P fuse block.
12. Ignition ON, connect a test lamp between the control circuit terminals:
* Control circuit terminals 5 and 6
* Control circuit terminals 2 and 3
13. Command all doors to LOCK and UNLOCK by using the driver door lock switch. The test lamp should illuminate during the LOCK and UNLOCK command.
• If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the I/P fuse block.
14. If all circuits test normal, test or replace the door latch.
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 ohm 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 ohm 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 (Crew Cab) (Rear Side Door Lock Replacement (Crew Cab))Rear Side Door Lock Replacement (Extended Cab Upper) (Rear Side Door Lock Replacement (Extended Cab Upper))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 (Programming and Relearning) for BCM replacement, setup, and programming