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Ignition Switch Key Light/Ceiling Light & Buzzer Circuit Test

Check continuity between diagnostic connector terminal No. 1 (Black wire) and body ground. Check continuity between driver's multiplex control unit terminal B13 (Light Blue wire) and diagnostic connector terminal No. 2 (Light Blue wire). See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, repair open in affected circuit. After repairs, recheck for DTCs.

DTC DIAGNOSIS

DTC Probable Cause
1 (1) Door-To-Driver's Multiplex Control Unit
1 (2) Door Multiplex Control Unit Faulty
1 (2) Driver's Multiplex Control Unit Faulty
2 (1) Driver's-To-Passengers Multiplex Control Unit
2 (2) Driver's Multiplex Control Unit Faulty
2 (2) Passenger's Multiplex Control Unit Faulty
3 (1) Passenger's-To-Driver's Multiplex Control Unit
3 (2) Passenger's Multiplex Control Unit Faulty
3 (2) Driver's Multiplex Control Unit Faulty
(1) Diagnose using COMMUNICATION LINE TESTS.
(2) Replace with a known-good control unit and recheck DTCs.
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