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B3130



DTC B3125, B3130, or B3135

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC DESCRIPTORs

DTC B3125
Left Front/Driver Door Only, Unlock Circuit

DTC B3130
All Unlock Circuit Short to Ground

DTC B3135
All Door Lock Circuit Short to Ground




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
For vehicles with the RPO AXA door lock system, the body control module (BCM) controls the door lock, passenger door unlock and driver door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the BCM senses a door lock/unlock switch activation or a keyless entry lock or unlock command.

For vehicles with the RPO AXC/AXE door lock system, the BCM controls the rear door lock and rear door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the BCM receives a door lock/unlock command from either the driver door module or the passenger door module or a keyless entry lock or unlock command

CONDITIONS FOR RUNNING THE DTC
The system voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B3125
The BCM detects a short to ground on the LF Door Unlock low reference circuit (AXA only)

B3130
The BCM detects a short to ground on the Doors Unlock low reference circuit (AXA or AXC/AXE)

B3135
The BCM detects a short to ground on the Doors Locked control circuit. (AXA or AXC/AXE).

ACTION TAKEN WHEN THE DTC SETS
- The BCM stores the DTC to memory.
- The power door locks will not operate

CONDITIONS FOR CLEARING THE DTC
- This DTC will change from current to history when the fault is no longer present.
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
- The technician issues a scan tool CLEAR DTCs command.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the harness connector X1 at the I/P Fuse Block.
2. Connect a test lamp between the control circuit terminal 38 and ground.
3. Ignition ON, command the Lock Doors ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- 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.
4. Connect a test lamp between the control circuit terminal 24 and B+.
5. Command the Driver Door Unlock ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- 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 and open/high resistance. If the circuit tests normal, replace the BCM.
6. Connect a test lamp between the control circuit terminal 64 and B+.
7. Command the Unlock Rear Doors ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- 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 and open/high resistance. If the circuit tests normal, replace the BCM.
8. If all circuits test normal, test or replace the appropriate relay.

COMPONENT TESTING
1. Ignition OFF, disconnect the applicable relay.
2. Test for 60-200 ohms of resistance between terminals 85 and 86.
- If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If less than infinite resistance, replace the relay.
4. Test for less than 2 ohms of resistance between terminals 30 and 87A.
- If greater than 2 ohms, replace the relay.
5. Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Measure for less than 2 ohms of resistance between terminals 30 and 87.
- If greater than 2 ohms, replace the relay.


REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)
- Programming and Relearning Programming and Relearning
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