Satellite Video (SDARV)

U0020-CAN B BUS OFF PERFORMANCE



- When Monitored:
- Continuously.
- Set Condition:
- Whenever the Can B Bus (+) or B Bus (-) circuit is open, shorted to voltage or shorted to ground, this code will set.






1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, erase all DTC's.
3. Cycle the ignition from on to off 3 times.
4. Turn the ignition on.
5. With the scan tool, read DTC's.

Does the scan tool display active: U0020-CAN B BUS OFF PERFORMANCE?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. 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. Repair as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test

2. CHECK FRONT CONTROL MODULE DTCs
1. With the scan tool, read Front Control Module DTCs

Does the scan tool display any CAN B BUS DTCs - ACTIVE?

Yes

- Diagnose and repair the DTC(s).

No

- Go to 3

3. CAN B BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the SDARV harness connector.
3. Disconnect the Front Control Module C1 harness connector.
4. Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 harness connector and the SDARV harness connector.

Does the ohm meter read open circuit?

Yes

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

No

- Go To 4

4. CAN B BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D54) Can B Bus (-) circuit between the Front Control Module C1 harness connector and the SDARV harness connector.

Does the ohm meter read open circuit?

Yes

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

No

- Replace the SDARV module.
- Perform BODY VERIFICATION TEST. Body Verification Test