Audio Receiver Assembly Communication Stop Mode: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the radio and display receiver assembly connector.
   Fig 1: Checking L189 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   L189-9 (CANH) - L189-10 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

NG → REPAIR OR REPLACE CAN MAIN BUS BRANCH WIRE OR CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying L191 & L146 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *A	for 6 Speakers
   *B	for 8 Speakers
   *a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L191-7 (GND1) - Body ground*1 L146-20 (GND1) - Body ground*2	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

   *1: for 6 Speakers

   *2: for 8 Speakers

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL) 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 3: Identifying L189, L191 & L146 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *A	for 6 Speakers
   *B	for 8 Speakers
   *a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L191-4 (+B1) - Body ground*1 L146-1 (+B1) - Body ground*2	Power switch off	11 to 14 V
   L191-3 (ACC1) - Body ground*1 L146-11 (ACC1) - Body ground*2	Power switch on (ACC)	11 to 14 V
   L189-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   *1: for 6 Speakers

   *2: for 8 Speakers

   Result

   Result	Proceed to
   OK (w/ Navigation system (for Radio and display type))	A
   OK (w/ Audio and visual system)	B
   NG	C

B → See step   5 

C → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

A → See step   4