B172D

B172D ROOF WARNING BUZZER





Description
Roof warning buzzer is installed to lower end of left center pillar, and indicates retractable hard top is in operation.




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 ROOF WARNING BUZZER
1. Start engine.
2. Check voltage between retractable hard top control unit harness connector and ground under the following conditions.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 2.
2.CHECK ROOF WARNING BUZZER POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect roof warning buzzer connector.
3. Check voltage between roof warning buzzer harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO-1 - Check 10 A fuse [No. 6 located in the fuse block (J/B)].
NO-2 - Check harness for open or short between roof warning buzzer and fuse.
3.CHECK ROOF WARNING BUZZER CIRCUIT
1. Disconnect retractable hard top control unit connector.
2. Check continuity between retractable hard top control unit harness connector and roof warning buzzer harness connector.





3. Check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace harness.
4.REPLACE ROOF WARNING BUZZER CIRCUIT
Replace roof warning buzzer. Refer to Retractable Hard Top System.
Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 5.
5.REPLACE RETRACTABLE HARD TOP CONTROL UNIT
Replace retractable hard top control unit. Refer to Service and Repair.
Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 6.
6.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END