Diagnostic Test
- CHECK FOR AN ACTIVE DTC
- With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
- Record the Environmental Data.
- With the scan tool, erase DTCs.
- Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
- With the scan tool, read BCM DTCs.
Did the DTC return?
Yes
- Go To 2
No
- Perform the TESTING FOR INTERMITTENT CONDITIONS procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
- CHECK FOR ADDITIONAL BCM DTCS
- With the scan tool, read BCM DTCs.
Is DTC: U1804-08-LIN 4-BUS SIGNAL/MESSAGE FAILURE also Active?
Yes
- Repair DTC: U1804-08-LIN 4-BUS SIGNAL/MESSAGE FAILURE before proceeding with this diagnostic procedure.
No
- Replace the Speed Control Switch in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL AND INSTALLATION .
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- With the scan tool, read BCM DTCs.