B1803

B1803-DRIVER DOOR LOCK/UNLOCK SWITCH INPUT CIRCUIT STUCK LOCK - DDM





For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:

Continuously whenever the door module is awake.

- Set Condition:

When the Lin Bus circuit is out of range for five seconds.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

With the scan tool, record and erase DTC's

Operate the Driver Door Lock Switch several times.

Turn the ignition on and wait 30 seconds.

With the scan tool, read DTC's.

Does the scan tool display B1803 - DRIVER DOOR LOCK/UNLOCK SWITCH INPUT 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 BODY VERIFICATION TEST - VER 1. Body Verification Test

2. DOOR LOCK SWITCH





Disconnect the Driver Window/Door Lock Switch C2 connector.

Turn the ignition on.

Measure the voltage between the (D500) Lin Bus circuit and the (D501) Lin Bus Return circuit.

Is the voltage between 6.5 and 12.5 volts?

Yes

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

No

- Go To 3

3. (D501) LIN BUS RETURN CIRCUIT OPEN





Using a 12-volt test light connected to 12-volts, check the (D501) Lin Bus Return circuit.

Does the test light illuminate brightly?

No

- Repair the (D501) Lin Bus Return circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

Yes

- Go To 4
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (D500) LIN BUS CIRCUIT OPEN





Disconnect the Driver Door Module C5 connector.

Measure the resistance of the (D500) Lin Bus circuit between the Door Module C5 connector and the Window/Door Lock Switch connector.

Is the resistance below 2.0 ohms?

No

- Repair the (D500) Lin Bus circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

Yes

- Go To 5
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5. (D500) LIN BUS CIRCUIT SHORT TO THE (D501) LIN BUS RETURN CIRCUIT





Measure the resistance between the (D500) Lin Bus circuit and the (D501) Lin Bus Return circuit in the Window/Door Lock Switch connector.

Is the resistance below 10,000.0 ohms?

Yes

- Repair the (D500) Lin Bus circuit for a short to the (D501) Lin Bus Return circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

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