DOOR LOCK SWITCH SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W.
- 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.
| Possible Causes |
| (P36) LEFT DOOR LOCK SWITCH MUX WIRE SHORT TO GROUND |
| (P36) RIGHT DOOR LOCK SWITCH MUX WIRE SHORT TO GROUND |
| LEFT DOOR LOCK SWITCH - SHORTED |
| RIGHT DOOR LOCK SWITCH - SHORTED |
| JUNCTION BLOCK SHORT TO GROUND |
| BODY CONTROL MODULE - DOOR LOCK SWITCH MUX SHORT TO GROUND |
Diagnostic Test
1. CHECK TROUBLE CODETurn 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 To2
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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 To3
No
- Go To4
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Left Door Lock Switch.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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 To6
Yes
- Go To5
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Right Door Lock Switch.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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 in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Body Control Module in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)