Door Lock Switch Short To Ground

DOOR LOCK SWITCH SHORT TO GROUND





For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:

Whenever the ignition is on.

- Set Condition:

When the BCM detects a voltage of less than 0.25 volts on the door lock switch mux input for over 5 seconds, this code will set. The normal voltage on the circuit is between 0.25 and 4.75 volts depending on switch positions. NOTE: Left and right switches are in parallel.





Diagnostic Test

1. CHECK TROUBLE CODE

Turn the ignition on.

With the scan tool, erase DTCs.

Operate the door locks several times from both door lock switches

With the scan tool read DTCs.

Does the scan tool display DOOR LOCK SWITCH SHORT TO GROUND?

Yes

- Go To 2

No

- Problem is intermittent and not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors and repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. CHECK THE LEFT DOOR LOCK SWITCH MUX CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.

Disconnect the Junction Block C2 connector.

Measure the resistance between ground and the (P36) Door Lock Switch Mux circuit cavity 14 in the JB-C2 connector.

Is the resistance below 1000.0 ohms?

Yes

- Go To 3

No

- Go To 4

3. CHECK LEFT DOOR LOCK SWITCH MUX WIRE FOR A SHORT TO GROUND





Disconnect the Left Door Lock Switch connector.

Measure the resistance between ground and the (P36) Door Lock Switch Mux circuit cavity 14 in the JB-C2 connector.

Is the resistance below 1000.0?

Yes

- Repair the (P36) Door Lock Switch Mux wire for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Left Door Lock Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. CHECK THE RIGHT DOOR LOCK SWITCH MUX CIRCUIT FOR A SHORT TO GROUND





Measure the resistance between ground and the (P36) Door Lock Switch Mux circuit cavity 10 in the JB-C2 connector.

Is the resistance below 1000.0 ohms?

No

- Go To 6

Yes

- Go To 5

5. CHECK RIGHT DOOR LOCK SWITCH MUX WIRE FOR A SHORT TO GROUND





Disconnect the Right Door Lock Switch connector.

Measure the resistance between ground and the (P36) Door Lock Switch Mux circuit cavity 10 in the JB-C2 connector.

Is the resistance below 1000.0 ohms?

Yes

- Repair the (P36) Door Lock Switch Mux wire for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Right Door Lock Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

6. CHECK THE JUNCTION BLOCK FOR A SHORT TO GROUND





Remove the Body Control Module from the Junction Block.

NOTE: Ensure the Junction Block C1, C2 and C3 connectors are connected before proceeding.

Measure the resistance between ground and the (P36) Door Lock Switch Mux circuit cavity 23 in the Junction Block - Body Control Module connector.

Is the resistance below 2000.0 ohms?

Yes

- Replace the Junction Block.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test