Inspection Procedure

1. Disconnect the connectors from the clearance warning ECU C9 and air conditioner amplifier connector A10 or A11.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   BBZ - Z-	Always	Below 1 Ω
   BBZ - Body ground	Always	10 kΩ or higher

Fig 1: Checking Harness And Connector (Clearance Warning ECU - Air Conditioner Amplifier)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Remove the integration control & panel assembly with the connectors still connected.
2. Using a service wire, ground the terminal Z- of the integration control & panel assembly connector.
3. Turn the ignition switch ON.
4. Check that the rear buzzer sounds.

   HINT:

   The clearance warning buzzer is separately excited, and will not sound unless an alternating voltage is applied.

   OK: Operating noise (clicking sounds) can be heard. 

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   OK	A
   NG	B (Auto A/C)
   NG	C (Manual A/C)

Fig 2: Inspecting Rear Buzzer
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: Go to step 3 

C:  Go to step  4

A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

1. Check that the malfunction disappears when a known good printed wire integration board sub-assembly is installed.

   OK: Malfunction disappears. 

NG: REPLACE AIR CONDITIONER AMPLIFIER 

OK: REPLACE PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY 

1. Check that the malfunction disappears when a known good integration panel sub-assembly is installed.

   OK: Malfunction disappears. 

NG: REPLACE AIR CONDITIONER AMPLIFIER 

OK: REPLACE INTEGRATION PANEL SUB-ASSEMBLY