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HANDS FREE ECU CHASSIS ELECTRICAL 54A-470 COMMENTS ON TROUBLE SYMPTOM PROBABLE CAUSES • The multivision display may be defective. • The hands free ECU may be defective. • The steering wheel audio remote control switch may be defective. • The steering wheel voice control switch may be defective. • Damaged harness wires and connectors DIAGNOSIS PROCEDURE STEP 1. Check the multivision display operation. Q: Is the check result normal? YES : Go to Step 2. NO : Perform Inspection Procedure 6: STEP 2. Operation check of the steering wheel Q: Is the check result normal? YES : Go to Step 3. NO : Troubleshoot the steering wheel audio STEP 3. Check the steering wheel voice control Q: Is the check result normal? YES : Go to Step 4. NO : Replace the steering wheel voice control STEP 4. Check the steering wheel audio remote Q: Is the check result normal? YES : Go to Step 5. NO : Replace the steering wheel audio remote STEP 5. Check the harness wire between C-202 • Check the communication lines for open circuit and short circuit. Q: Is the check result normal? YES : Go to Step 6. NO : Repair the wiring harness. STEP 6. Connector check: C-204 clock spring Q: Is the check result normal? YES : Go to Step 7. NO : Repair the defective connector. AC612708 AR Connectors: C-202, C-204, C-209 <LHD> C-202 (R) C-204 C-209 (Y) AC612716 AI Connectors: C-202, C-204, C-209 <RHD> C-202 (R) C-204 C-209 (Y) |