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 |
|---|---|---|---|---|
Lock Relay B+ | 3 | 3 | -- | -- |
Unlock Relay B+ | 3 | 3 | -- | -- |
Driver Door Handle Switch Signal | B3849 00, B3849 02 | 1 | 1 | -- |
Passenger Door Handle Switch Signal | B1474 02 | 2 | 2 | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Lock Relay Control | B3135 00 | 3 | 3 | -- |
LR Door Latch Control | 3 | 3 | 3 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
RR Door Latch Control | 3 | 3 | 3 | -- |
Unlock Relay Control | 3 | 3 | B3130 00 | -- |
Driver Door Handle Switch Ground | -- | 1 | 1 | -- |
Passenger Door Handle Switch Ground | -- | 2 | 2 | -- |
Lock Relay Ground | -- | 3 | 3 | -- |
Unlock Relay Ground | -- | 3 | 3 | -- |
1. Driver Door Lock Malfunction 2. Passenger Door Lock Malfunction 3. Rear Door Lock 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. The BCM applies ground to the rear door lock actuator unlock control circuit which energizes the unlock relay coil.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
Conditions for Setting the DTC
B3130 00
The BCM detects a short to voltage on the rear door unlock control circuit.
B3135 00
The BCM detects a short to ground on the rear door lock control circuit.
Actions Taken When the DTC Sets
The BCM will disable all rear door unlock 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 Latch Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Command the rear doors to LOCK and UNLOCK with the scan tool, the rear doors should perform the LOCK and UNLOCK function.
| ⇒ | If B3130 00 is current, refer to UNLCK Relay Control Circuit Malfunction. |
| ⇒ | If B3135 00 is current, refer to LCK Relay Control Circuit Malfunction |
Circuit/System Testing
UNLCK Relay Control Circuit Malfunction
- Ignition OFF, disconnect the UNLCK relay.
- Connect a test lamp between the control circuit terminal 85 and the B+ circuit terminal 86.
- Command the rear doors to UNLOCK with a scan tool. The test lamp should briefly illuminate when commanding the UNLOCK state.
- If all circuits test normal, test or replace the UNLCK relay.
| ⇒ | 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. |
LCK Relay Control Circuit Malfunction
- Ignition OFF, disconnect the LCK relay.
- Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
- Command the rear doors to LOCK with a scan tool. The test lamp should briefly illuminate when commanding the LOCK state.
- If all circuits test normal, test or replace the LCK relay.
| ⇒ | 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. |
Component Testing
Relay Test
- 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 the 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 less than the specified value, replace the relay. |
| ⇒ | If greater than the specified range, replace the relay. |
| ⇒ | If greater than 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 |
