U1122

U1122-LOST COMMUNICATION WITH LIN ECU 2





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

- When Monitored:
With the ignition on.

- Set Condition:
LIN 1 Bus Performance.





1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Wait 30 seconds.
4. With the scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST Body Verification Test.

2. CHECK VOLTAGE AT COMPASS MODULE




1. Turn the ignition off.
2. Disconnect the Compass Module harness connector.
3. Turn the ignition on.
4. Check the voltage of the (F921) Fused Run Relay Output circuit.

Is the voltage above 10 volts?

Yes

- Go To 3

No

- Repair the (F921) Fused Run Relay Output circuit for an open.
- Perform the BODY VERIFICATION TEST Body Verification Test.

3. CHECK GROUND CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between ground and the (Z915) Ground circuit.

Is the resistance above 10K ohms?

Yes

- Repair the (Z915) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 4

4. CHECK LIN BUS CIRCUIT FOR AN OPEN




1. Disconnect the Cluster C1 harness connector.
2. Measure the resistance of the (D500) LIN Bus circuit.

Is the resistance below 10K ohms?

Yes

- Replace the Cluster.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

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