Power Seats

U0024-CAN B BUS (-) CIRCUIT OPEN






WHEN MONITORED
Continuously

SET CONDITION
The Seat Memory Module detects the (D54) CAN B Bus (-) circuit is open.

POSSIBLE CAUSES
- (D54) CAN B BUS (-) circuit open
- Seat memory module

Theory of Operation

Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION
Turn 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.

Q: 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. (D54) CAN B BUS (-) CIRCUIT OPEN




Turn the ignition off.
Disconnect the Seat Memory Module C1 harness connector.
Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

Q: Is there any voltage present?

YES:Inspect the wiring and connectors for damage or shorted circuits. If Ok, replace the Seat Memory Module. Perform POWER SEAT SYSTEM VERIFICATION TEST -VER 1. Power Seat System Verification Test
NO: Repair the (D54) CAN B Bus (-) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test