Preliminary Tests
- Ensure fuse No. 9 (7.5-amp) located in driver's underdash fuse/relay box and fuse No. 13 (7.5-amp) located in passenger's underdash fuse/relay box. If fuses are blown, locate and repair cause of blown fuse. If fuse(s) are okay, perform affected/appropriate MULTIPLEX CONTROL UNIT test. Repair as necessary. After repairs, go to next step.
- Check for Diagnostic Trouble Codes (DTCs). See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCs) under SELF-DIAGNOSTIC MODE 1 TESTS. Repair as necessary. If no DTC is indicated, proceed to WAKE-UP FUNCTION TESTS under SELF-DIAGNOSTICS.