Pinpoint Test B: All DIMMABLE Switch Illumination Is Inoperative

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK FOR RECORDED SJB DTCs FROM THE ON-DEMAND SELF-TEST
- Use the recorded results from the SJB self-test.
- Is DTC B29B7 present?
- Yes : GO to B2.
- No : VERIFY the SJB fuse 10 (15A) is OK. If OK, GO to B2. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short. After the repair:
  If no DTCs are present, TEST the system for normal operation.
  
  If DTC B106E is present, CLEAR the DTCs and REPEAT the self-test (required to enable the backlighting output driver if DTC B106E is present) . TEST the system for normal operation.
  
  If DTC B106F is present, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES -- MKS article. TEST the system for normal operation.
B2 BYPASS THE SJB
- Ignition OFF.
- Disconnect: SJB C2280b.
- Connect a fused jumper wire between the SJB C2280b-52, circuit VLN37 (BU/WH) and battery positive.
- Do the backlighting components illuminate?
- Yes : REMOVE the jumper wire. GO to B3.
- No : REMOVE the jumper wire. VERIFY the SJB fuse 10 (15A) is OK. REPAIR circuit VLN37 (BU/WH) for an open. TEST the system for normal operation.
B3 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES -- MKS article. TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.