Audio Receiver Assembly Communication Stop Mode: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the H89 radio receiver assembly connector.
   Fig 1: H89 Radio Receiver Assembly Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H89-9 (CANH) - H89-10 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

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

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (RADIO RECEIVER ASSEMBLY) 

OK: Go to next step 

1. Disconnect the H90 radio receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: H90 & H89 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H90-20 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H90-11 (ACC1) - Body ground	Power switch on (ACC)	11 to 14 V
   H90-1 (+B1) - Body ground	Power switch off	11 to 14 V
   H89-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V

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

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

OK → See step   3