Inspect Radio Receiver Assembly Circuit

Disconnect the connectors from the radio receiver assembly, and inspect the connector on the wire harness side.

Fig 1: Identifying Radio Receiver Connector A & B Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RADIO RECEIVER CIRCUIT

Tester connection	Condition	Specified condition
A1 - Ground (FR+)	Audio sounding	5-7 V
A2 - Ground (FL+)	Audio sounding	5 - 7 V
A3 - Ground (ACC)	Ignition switch ACC	Battery positive voltage
A4 - Ground (+B)	Constant	Battery positive voltage
A5 - Ground (FR-)	Audio sounding	5 - 7 V
A6 - Ground (FL-)	Audio sounding	5-7 V
A7 - Ground (E)	Constant	Continuity
A10 - Ground (ILL+)	Light control switch TAIL or HEAD	Battery positive voltage
B1 - Ground (RR+)	Audio sounding	5-7 V
B2 - Ground (RL+)	Audio sounding	5 - 7 V
B3 - Ground (RR-)	Audio sounding	5 - 7 V
B6 - Ground (RL-)	Audio sounding	5 - 7 V

If the circuit is not as specified, inspect the circuits connected to other parts.