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 Descriptors
DTC B3130 00: All Door Unlock CircuitDTC B3135 00: All Door Lock Circuit
Diagnostic 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+ | 3 | 3 | -- | -- |
Door Unlock Relay Coil B+ | 3 | 3 | -- | -- |
Door Unlock Relay Switch B+ | 3 | 3 | -- | -- |
Door Unlatch (Limo) Relay Switch B+ | 4 | 4 | -- | -- |
Right Middle Door Park Relay Switch B+ | 4 | 4 | -- | -- |
Left Middle Door Park Relay Switch B+ | 4 | 4 | -- | -- |
PDM 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 | 1, 2, 3 | -- |
Driver Door Key Switch Signal | 1, 2, 3 | 1, 2, 3 | 1, 2, 3 | -- |
Park Enable Signal | B0005 00 | 4 | 4 | -- |
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 | 3 | 3 | 3 | -- |
Rear Door Latch Actuator Unlock Control | 3 | 3 | 3 | -- |
Middle Door Latch Actuator Lock Control | 3 | 3 | 3 | -- |
Middle Door Latch Actuator Unlock Control | 3 | 3 | 3 | -- |
Back Door Latch Actuator Lock Control | 3 | 3 | 3 | -- |
Back Door Latch Actuator Unlock Control | 3 | 3 | 3 | -- |
Right Middle Door Release Switch Control | 4 | 4 | 4 | -- |
Left Middle Door Release Switch Control | 4 | 4 | 4 | -- |
DDM Ground | -- | U0199 00 | U0199 00 | -- |
Door Unlock Relay Switch Ground | -- | 4 | 4 | -- |
Door Lock Relay Coil Ground | -- | 4 | 4 | -- |
Door Lock Relay Switch Ground | -- | 4 | 4 | -- |
Door Unlatch (Limo) Relay Coil Ground | -- | 4 | 4 | -- |
Left Middle Door Park Relay Ground | -- | 4 | 4 | -- |
Right Middle Door Park Relay Ground | -- | 4 | 4 | -- |
PDM Ground | -- | U0200 00 | U0200 00 | -- |
1. Driver Door Latch Malfunction 2. Passenger Door Latch Malfunction 3. Rear, Middle, Back Door Latch Malfunction 4. Release Switch Malfunction | ||||
Circuit/System Description
The body control module (BCM) internally grounds the door lock relay control circuit for the rear door lock relay when it receives a serial data message from the driver door module (DDM), passenger door module (PDM). When the BCM grounds the door lock relay control circuit the rear door lock relay is energized and locks the rear doors.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
B3130 00
The BCM detects a fault on the UNLOCK relay control circuit.
B3135 00
The BCM detects a short to ground on the LOCK relay control circuit.
Action Taken When the DTC Sets
The rear door locks will malfunction.
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.
| ⇒ | If B3135 00 is set refer to Door Lock Malfunction |
| ⇒ | If B3130 00 is set, refer to Door Unlock Malfunction |
Circuit/System Testing
Door Lock Malfunction
- Ignition OFF, disconnect the LOCK relay.
- Test for less than 15 ohms between the relay coil ground circuit terminal and ground.
- Connect a test lamp between the relay coil ground circuit terminal and the relay coil control circuit terminal.
- Ignition ON, command the rear doors to LOCK with a scan tool. The test lamp should briefly illuminate when commanding the LOCK state.
- If the circuit tests normal, test or replace the LOCK 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 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. |
Door Unlock Malfunction
- Ignition OFF, disconnect the UNLOCK relay.
- Ignition ON, verify that a test lamp illuminates between the relay coil B+ circuit terminal and ground.
- Connect a test lamp between the relay coil B+ circuit terminal and the relay coil control circuit terminal.
- Command the rear doors to UNLOCK with a scan tool. The test lamp should briefly illuminate when commanding the UNLOCK state.
- If the circuit tests normal, test or replace the UNLOCK relay
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | 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. |
Component Testing
- Ignition OFF, disconnect the appropriate 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 3A fused jumper wire between relay terminal 85 and 12V. 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 |
