B172B

B172B ROOF STATUS SIGNAL (AUDIO)





Description
Retractable hard top control unit transmits retractable hard top open and close states to audio volume control unit (BOSE amplifier). Audio volume control unit (BOSE amplifier) automatically switches equalizer according to retractable hard top open or close state that is received. For the detail, refer to System Description.




DTC Logic

DTC DETECTION LOGIC

NOTE:
If two or more DTCs are detected, refer to Retractable Hard Top Control Unit, and determine trouble diagnosis order.






DTC CONFIRMATION PROCEDURE
1. PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine.
2. Operate retractable hard top to fully open and fully close.
3. Check DTC.
Is DTC detected?
YES - Go to B171C.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK BOSE AMP. OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BOSE AMP. harness connector.
3. Turn ignition switch ON.
4. Check voltage between BOSE AMP. harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK BOSE AMP. OUTPUT SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect retractable hard top control unit harness connector.
3. Check continuity between retractable hard top control unit harness connector and BOSE AMP. harness connector.





4. Check harness for short to ground and short to power.
Is the inspection result normal?
YES - Replace retractable hard top control unit. Refer to Service and Repair.
NO - Repair or replace harness.
3.CHECK BOSE AMP.
Check BOSE AMP. Refer to BOSE Audio With Navigation.
Is the inspection result normal?
YES - GO TO 4.
NO - Replace BOSE AMP. Refer to BOSE Audio With Navigation.
4.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END