DTC B1009 Hummer
MICU Lost Communication With Combination Switch Control Unit (Wiper Washer Switch Message)
MICU Lost Communication With Combination Switch Control Unit (Wiper Washer Switch Message)
Description
Poor communication between the MICU, and the combination switch control unit. NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.
Cause and Solution
Loose or poor connections
Blown fuse
Faulty battery and or charging system
Perform the combination switch control unit input test
Perform the MICU Input Test
Open or Short circuit
Faulty combination switch control unit
Faulty Multiplex Integrated Control System (MICU)
Video Guide
Diagnostic Info
- DTC Code: B1009
- Brand: Hummer