Control Switch Circuit

HINT: While carrying out the following inspection, make certain that the connectors and terminals are properly connected. CONTROL SWITCH

Connect connector to control switch. Disconnect connectors from CC ECU and inspect connectors on wire harness side as follows.

Disconnect connector from control switch and inspect connector on wire harness side as follows.

INSPECT GROUND CONNECTION

Is there continuity between terminal 3 (B-1 7) and ground?

Yes f

INSPECT CONTROL SWITCH (See page BE-129) Is control switch operation normal?

CC ECU

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Connect connector to control switch. Disconnect connectors from CC ECU and inspect connectors on wire harness side as follows.

Open circuit in wire harness between terminal 3 (B-17) of control switch and ground. Ground faulty.

Replace control switch. Then recheck system.

INSPECT, MAIN SWITCH CIRCUIT

Is there no continuity between terminal A-8 and ground with main switch OFF?

NC

Short circuit in wire harness between terminals A-8 of CC ECU and 5 (B-1 5) of control switch.

Yes

Open circuit in wire harness between terminals A-8 of CC ECU and 5 (B-1 5) of control switch.

Is there continuity between terminal A-8 and ground with main switch ON?

INSPECT CONTROL SWITCH CIRCUIT

Is there no continuity between terminal B-8 and ground with control switch OFF?

Is there resistance as shown in table below between terminal B-8 and ground when control switch is turned to each position?

Replace CC ECU. Then recheck system

Open circuit in wire harness between terminals A-8 of CC ECU and 5 (B-1 5) of control switch.

Short circuit in wire harness between terminals B-8 of CC ECU and 4 (B-5) of control switch.

Is there resistance as shown in table below between terminal B-8 and ground when control switch is turned to each position?

Open circuit in wire harness between terminals B-8 of CC ECU and 4 (B-5) of control switch.

Replace CC ECU. Then recheck system

Open circuit in wire harness between terminals B-8 of CC ECU and 4 (B-5) of control switch.

( ): without Airbag System CC: Cruise Control

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