Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B3135 00: All Door Lock CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
DDM B+ | U0199 00 | U0199 00 | -- | -- |
Door Lock Relay Switch B+ | 4 | 4 | -- | -- |
Door Unlock Relay Coil B+ | 3 | 3 | -- | -- |
Door Unlock Relay Switch B+ | 3 | 3 | -- | -- |
Door Unlatch (Limo) Relay Switch B+ | 5 | 5 | -- | -- |
Right Middle Door Park Relay Switch B+ | 5 | 5 | -- | -- |
Left Middle Door Park Relay Switch B+ | 5 | 5 | -- | -- |
FPDM B+ | U0200 00 | U0200 00 | -- | -- |
Driver Door Lock Actuator Lock Control | B3225 00 | B3225 00 | B3225 00 | -- |
Driver Door Lock Actuator Unlock Control | B3225 00 | B3225 00 | B3225 00 | -- |
Driver Door Key Switch Low Reference | -- | 1,2,3,4 | 1,2,3,4 | -- |
Driver Door Key Switch Signal | 1,2,3,4 | 1,2,3,4 | 1,2,3,4 | -- |
Park Enable Signal | B0005 00 | 5 | 5 | -- |
Passenger Door Lock Actuator Lock Control | B3135 00 | B3135 00 | B3135 00 | -- |
Passenger Door Lock Actuator Unlock Control | B3130 00 | B3130 00 | B3130 00 | -- |
Rear Door Latch Actuator Lock Control | 4 | 4 | 4 | -- |
Rear Door Latch Actuator Unlock Control | 3 | 3 | 3 | -- |
Middle Door Latch Actuator Lock Control | 4 | 4 | 4 | -- |
Middle Door Latch Actuator Unlock Control | 3 | 3 | 3 | -- |
Back Door Latch Actuator Lock Control | 4 | 4 | 4 | -- |
Back Door Latch Actuator Unlock Control | 3 | 3 | 3 | -- |
Right Middle Door Release Switch Control | 5 | 5 | 5 | -- |
Left Middle Door Release Switch Control | 5 | 5 | 5 | -- |
DDM Ground | -- | U0199 00 | U0199 00 | -- |
Door Unlock Relay Switch Ground | -- | 3 | 3 | -- |
Door Lock Relay Coil Ground | --- | 4 | 4 | -- |
Door Lock Relay Switch Ground | -- | 4 | 4 | -- |
Door Unlatch (Limo) Relay Coil Ground | -- | 5 | 5 | -- |
Left Middle Door Park Relay Ground | -- | 5 | 5 | -- |
Right Middle Door Park Relay Ground | -- | 5 | 5 | -- |
FPDM Ground | -- | U0200 00 | U0200 00 | -- |
1. Driver Door Latch Malfunction 2. Passenger Door Latch Malfunction 3. Rear, Middle, Back Door Unlock Inoperative 4. Rear, Middle, Back Door Lock Inoperative 5. Release Switch Malfunction | ||||
Circuit/System Description
The rear passenger door locks are controlled by the body control module (BCM). When a door lock switch is operated to the lock position, the BCM applies voltage to the rear door lock actuator lock control circuit which energizes the lock relay. With the lock relay coil energized, the switch contacts close allowing battery voltage to flow from the REAR DR LCK fuse through the relay switch contacts to the left and right door lock/unlock motors. A ground path is provided by the unlock relay controlled output circuit through the unlock relay switch contacts to ground. The process to unlock the rear doors reverses the flow of current. The BCM applies ground to the rear door lock actuator unlock control circuit which energizes the unlock relay coil. With the unlock relay coil energized, the switch contacts close allowing battery voltage to flow from the REAR DR LCK fuse through the relay switch contacts to the left and right door lock/unlock motors. Ground is provided through the lock relay controlled output circuit through the lock relay switch contacts to ground .
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
When the BCM detects a fault in the rear door lock relay control circuit.
Actions Taken When the DTC Sets
The BCM will disable all lock requests.
Conditions for Clearing the DTC
| • | The DTC will be current for as long as the fault is present. |
| • | When the fault is no longer present, the DTC will be a history DTC. |
| • | A history DTC will clear after 50 ignition cycles |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation .
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, command the rear doors to LOCK and UNLOCK with a scan tool. The rear doors should perform the LOCK and UNLOCK functions.
Circuit/System Testing
- Ignition OFF, disconnect the DR LCK relay.
- Test for less than 1 ohm between the ground circuit terminal 4 and ground.
- Connect a test lamp between the control circuit terminal 3 and ground.
- Ignition ON, command the rear door locks to LOCK and UNLOCK with a scan tool. The test lamp should briefly illuminate when changing between the commanded states.
- If the circuits test normal, test or replace the DR LCK relay.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | 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 an open/high resistance. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the DR LCK relay.
- Test for 60-200 ohms between terminals 85 and 86.
- Test for infinite resistance between the following terminals:
- Test for less than 2 ohms between terminals 30 and 87A.
- Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
| ⇒ | If not within the specified range, replace the relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If not the specified value, replace the relay. |
| ⇒ | If greater than the specified range, replace the relay. |
| ⇒ | If greater than the specified range, replace the relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
