U0021-CAN B BUS (+) CIRCUIT OPEN
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
Continuously
- Set Condition:
The Memory Seat Module detects the (D55) CAN B Bus (+) circuit is open.
| Possible Causes |
| (D55) CAN B BUS (+) CIRCUIT OPEN |
| MEMORY SEAT MODULE |
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, record and erase MSM DTC's
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active MSM DTC's.
Does the scan tool display this DTC as active?
Yes
- Go To 2
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. (D55) CAN B BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Memory Seat Module C1 harness connector.
Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.
Is there any voltage present?
Yes
- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Memory Seat Module in accordance with the service information.
- Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
No
- Repair the (D55) CAN B Bus (+) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.