U1191

U1191-LOST COMMUNICATION WITH UPPER SWITCH BANK





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

- When Monitored:
With the ignition on.

- Set Condition:
The Cluster does not receive information from the Upper Switch Bank.





1. CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. Using the scan tool, record and erase DTCs.
3. Wait 30 seconds.
4. Using the scan tool, read DTCs.

Does the scan tool display this DTC as 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 chafed, 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. (D500) LIN BUS CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Upper Switch Bank harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D500) LIN BUS circuit.

Is the voltage above 5 Volts?

Yes

- Go To 4

No

- Go To 3

3. (D500) LIN BUS CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Instrument Cluster C1 harness connector.
3. Measure the resistance of the (D500) LIN BUS circuit between the Cluster C1 and the Upper Switch Bank harness connectors.

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.

4. (A108) FUSED B+ CIRCUIT OPEN




1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (A108) Fused B+ circuit at the Upper Switch Bank harness connector.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the (A108) Fused B+ circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. (Z18) GROUND CIRCUIT OPEN




1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z18) Ground circuit at the Upper Switch Bank harness connector.

Does the test light illuminate brightly?

Yes

- Replace the Upper Switch Bank.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (Z18) ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.