B1804

B1804 DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK UNLOCK - DRIVER DOOR MODULE





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Continuously

- Set Condition:
When the Driver Door Lock Switch Mux circuit is between 0.5 volts and 1.5 volts for over 30 seconds.





Theory of Operation

If this vehicle is equipped with the Memory System, the supply circuit for the Memory Mirrors are supplied by the Driver Door Module. Therefore, both the Memory Select Switch Mux or the Door Lock Switch Mux circuits can cause this DTC to set.

Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTC's
Operate the Driver Door Lock Switch in both positions several times.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTC's.
Does the scan tool display B1804-DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK UNLOCK?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. DRIVER DOOR LOCK SWITCH SHORTED TO GROUND




With the scan tool, erase DTC's.
Disconnect the Driver Window/Door Lock Switch connector.
Turn the ignition on.
With the scan tool, read DTC's.
Does the scan tool display DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK UNLOCK?

No

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

Yes

- Go to 3

3. (G161/LHD) OR (G160/RHD) DOOR LOCK SWITCH MUX WIRE SHORT TO GROUND




Turn the ignition off.
Disconnect the Driver Door Module C2 connector.
Measure the resistance between ground and the (G161/LHD) or (G160/RHD) Door Lock Switch Mux circuit in the Driver Door Module connector.
Is the resistance below 10000.0 ohms?

Yes

- Repair the (G161/LHD) or (G160/RHD) Door Lock Switch Mux circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go to 4

4. VEHICLE EQUIPPED WITH MEMORY SYSTEM?
Is this vehicle equipped with the Memory System?

No

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

Yes

- Go to 5

5. (P439) MEMORY SELECT MUX WIRE SHORT TO GROUND




Disconnect the Driver Door Module C3 connector.
Measure the resistance between ground and the (P439) Memory Select Switch Mux circuit.
Is the resistance below 10000.0 ohms?

Yes

- Repair the (P439) Memory Select Switch Mux wire for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go to 6

6. (P439) MEMORY SELECT SWITCH MUX CIRCUIT SHORTED




Measure the resistance between the (P439) Memory Select Switch Mux circuit and the (G920) Memory Select Switch Return circuit in the Driver Door Module C3 connector.
Is the resistance below 10000.0 ohms?

Yes

- Go to 7

No

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

7. MEMORY SELECTOR SWITCH SHORTED




Disconnect the Memory Selector Switch connector.
Measure the resistance between the (P439) Memory Select Switch Mux circuit and the (G920) Memory Select Switch Return circuit in the Driver Door Module C3 connector.
Is the resistance below 10000.0 ohms?

Yes

- Repair the (P439) Memory Select Switch Mux circuit for a short to the (G920) Memory Select Switch Return circuit.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Memory Selector Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test