Power Top
U0019-CAN B BUS
For a complete wiring diagram Refer to Diagrams/Electrical.
- When Monitored:
Continuously
- Set Condition:
Whenever the CAN B Bus (+) or CAN B Bus (-) circuit is open, shorted to voltage or shorted to ground.
Diagnostic Test
1. CHECK FOR ACTIVE DTCS
With the scan tool, read the active DTC's.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
Turn the ignition off and wait 30 seconds.
Turn the ignition on.
With the scan tool, read the active DTC's.
Does the scan tool display this DTC as active?
Yes
- Go To 2
No
- If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
-
2. CHECK TOTALLY INTEGRATED POWER MODULE (TIPM) DTC's
With the scan tool, read TIPM active DTC's
Does the scan tool display any CAN B BUS DTC's - ACTIVE?
Yes
- Testing and Inspection
-
No
- Go To 3
-
3. (D55) CAN B BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the Sunroof Motor/Module connector.
Disconnect the TIPM C6 connector.
Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM C6 connector and the Sunroof Motor/Module connector.
Is the resistance below 2.0 ohms?
Yes
- Go To 4
No
- Repair the (D55) CAN B Bus (+) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
4. (D54) CAN B BUS (-) CIRCUIT OPEN
Measure the resistance of the (D54) CAN B Bus (-) circuit between the TIPM C6 connector and the Sunroof Motor/Module connector.
Is the resistance below 2.0 ohms?
Yes
- Replace the Sunroof Motor/Module.
- Perform the Sunroof Position Calibration, Sunroof Position Calibration . Perform the Excessive Force Limitation Calibration, .
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test