DOOR LOCK SWITCH OPEN OR SHORT TO VOLTAGE

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 greater than 4.75 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

(P37) LEFT DOOR LOCK SWITCH GND WIRE OPEN

(P36) LEFT DOOR LOCK SWITCH MUX WIRE OPEN

(P36) LEFT DOOR LOCK SWITCH MUX WIRE SHORT TO VOLTAGE

(P37) RIGHT DOOR LOCK SWITCH GND WIRE OPEN

(P36) RIGHT DOOR LOCK SWITCH MUX WIRE OPEN

(P36) RIGHT DOOR LOCK SWITCH MUX WIRE SHORT TO VOLTAGE

LEFT DOOR LOCK SWITCH - OPEN

LEFT DOOR LOCK SWITCH - SHORTED

RIGHT DOOR LOCK SWITCH - OPEN

RIGHT DOOR LOCK SWITCH - SHORTED

JUNCTION BLOCK OPEN

BODY CONTROL MODULE - DOOR LOCK SWITCH MUX OPEN

Diagnostic Test

1.CHECK TROUBLE CODE

Does the scan tool display DOOR LOCK SWITCH OPEN OR SHORT TO VOLTAGE?

Yes

Go To2

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 DOOR LOCK SWITCH MUX CIRCUIT FOR A SHORT TO VOLTAGE

Which cavity had greater than 0.5 volts?

Cavity 14 - Left Door

Go To3

Cavity 10 - Right Door

Go To4

Neither circuit over 0.5 volts.

Go To5

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

Is there any voltage present?

Yes

Repair the (P36) Door Lock Switch Mux wire for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Replace the Left Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

4.CHECK RIGHT DOOR LOCK SWITCH MUX WIRE FOR A SHORT TO VOLTAGE

Is there any voltage present?

Yes

Repair the (P36) Door Lock Switch Mux wire for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Replace the Right Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

5.CHECK DOOR LOCK SWITCH MUX CIRCUIT FOR AN OPEN

Which circuit was NOT between 4500 and 5500 ohms?

Cavities 5 & 10 - Right Door

Go To6

Cavities 11 & 14 - Left Door

Go To8

Both were approximately 5000 ohms.

Go To10

6.CHECK RIGHT DOOR LOCK SWITCH MUX WIRE FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Go To7

Repair the (P36) Door Lock Switch Mux wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

7.CHECK RIGHT DOOR LOCK SWITCH GROUND WIRE FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Replace the Right Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Repair the (P37) Door Lock Switch Ground wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

8.CHECK LEFT DOOR LOCK SWITCH MUX WIRE FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Go To9

Repair the (P36) Door Lock Switch Mux wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

9.CHECK LEFT DOOR LOCK SWITCH GROUND WIRE FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Replace the Left Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Repair the (P37) Door Lock Switch Ground wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

10.CHECK THE JUNCTION BLOCK FOR AN OPEN

NOTE: Make all measurements in the Junction Block – NOT the harness connector.

Is the resistance below 1.0 ohm for each circuit?

Yes

Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Replace the Junction Block.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)