U0037

U0037-LIN BUS CIRCUIT LOW







- When Monitored:
Continuously when the ignition is on.

- Set Condition:
The module detects a short to ground on the LIN Bus circuit.





1. VERIFY DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read active Door Module DTCs.

Does the scan tool display: U0037-LIN BUS CIRCUIT LOW as Active?

Yes

- Go To 2

No

- Stored Lost Communication DTCs and perform the Stored Lost Communication DTCs diagnostic procedure.

2. CHECK THE LIN BUS CIRCUIT




1. Turn the ignition off.
2. Disconnect the Driver Window/Door Lock Switch C2 connector.
3. Turn the ignition on.
4. Measure the voltage between the (D500) LIN Bus circuit and the (D501) Lin Bus Return circuit.

Is the voltage above 7.0 volts?

No

- Go To 3

Yes

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

3. (D500) LIN BUS CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the Driver Door Module C5 connector.
3. Measure the resistance between Ground and the (D500) LIN Bus circuit in the Door Module C5 connector.

Is the resistance below 10,000 Ohms?

Yes

- Repair the (D500) LIN Bus circuit for a short to the ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. (D500) LIN BUS CIRCUIT SHORTED TO THE (D501) LIN BUS RETURN CIRCUIT




1. Measure the resistance between the (D500) LIN Bus circuit and the (D501) LIN Bus Return circuit in the Door Module C5 connector.

Is the resistance below 10,000 Ohms?

Yes

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

No

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