Inspection Procedure

1. Remove the RADIO NO. 1, P-ACC and P-IG1-1 fuses from the passenger side junction block.
2. Measure the resistance of the fuses.

   Standard resistance 

   TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   RADIO NO.1 fuse	Always	Below 1 Ω
   P-ACC fuse	Always	Below 1 Ω
   P-IG1-1 fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: GO TO NEXT STEP 

1. Disconnect the L59 display connector.
   Fig 2: Identifying Display And Navigation Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of according to the value(s) in the table below.

   Standard resistance 

   TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   L59-10(GND1) - Body ground	Always	Below 1 Ω

3. Measure the voltage of according to the value(s) in the table below.

   Standard voltage 

   TERMINALS VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   L59-1(+B1) - L59-10 (GND1)	Always	11 to 14 V
   L59-2(ACC) - L59-10 (GND1)	Engine switch on (ACC)	11 to 14 V
   L59-3(IG) - L59-10 (GND1)	Engine switch on (IG)	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   )