B1803

B1803-DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK





For a complete wiring diagram, refer to the Wiring Information.

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.

- When Monitored:
Continuously

- Set Condition:
When the Driver Door Lock Switch Mux circuit is between 2.0 volts and 3.0 volts for over 30 seconds, this code will set.





1. TEST FOR INTERMITTENT CONDITION
1. With the scan tool, record and erase the DTCs.
2. Operate the Driver Door Lock Switch in both positions several times.
3. Cycle the ignition from on to off three times.
4. Turn the ignition on.
5. With the scan tool, read the DTCs.

Does the scan tool display B1803-DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK?

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 the BODY VERIFICATION TEST. Body Verification Test.

2. DRIVER DOOR LOCK SWITCH SHORTED TO GROUND




1. With the scan tool, erase the DTCs.
2. Disconnect the Driver Window/Door Lock Switch connector.
3. Turn the ignition on.
4. With the scan tool, read the DTCs.

Does the scan tool display DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK?

Yes

- Go To 3

No

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

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




1. Turn the ignition off.
2. Disconnect the Driver Door Module C2 connector.
3. 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 10,000 Ohms?

Yes

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

No

- Go To 4

4. VEHICLE EQUIPPED WITH MEMORY SYSTEM?

Is this vehicle equipped with the Memory System?

Yes

- Go To 5

No

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

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




1. Disconnect the Driver Door Module C3 connector.
2. Measure the resistance between ground and the (P439) Memory Select Switch Mux circuit.

Is the resistance below 10,000 Ohms?

Yes

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

No

- Go To 6

6. (P439) MEMORY SELECT SWITCH MUX CIRCUIT SHORTED




1. 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 10,000 Ohms?

Yes

- Go To 7

No

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

7. MEMORY SELECTOR SWITCH SHORTED




1. Disconnect the Memory Selector Switch connector.
2. 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 10,000 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. Body Verification Test.

No

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