Inspection Procedure

PREPARATION: 

See input signal check in PRE-CHECK .

CHECK: 

Check the indicator light operation when each of the SET/COAST, RESUME/ACCEL and CANCEL is turned on.

OK: 

SET/COAST, RESUME/ACCEL switch 

The signals shown in  Fig 1  should be output when each switch is ON. The signal should disappear when the switch is turned OFF. 

CANCEL switch 

The indicator light goes off when the cancel switch is turned ON. 

Fig 1: Indicator Light Blinking Pattern Chart

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1. OK: Wait and see. 
2. NG: Go to next step. 

PREPARATION: 

1. Remove the ECU with connector still connected.
2. Turn ignition switch ON.

CHECK: 

Measure voltage between terminals 18 of ECU connector and body ground, when each of the SET/COAST, RESUME/ACCEL and CANCEL is turned ON.

Fig 2: Checking Voltage Between Terminals CCS Of Cruise Control ECU Connector And Body Ground

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1. NG: Proceed to next circuit inspection shown in problem symptom table (See  PROBLEM SYMPTOMS TABLE  ).  
2. OK: Go to next step. 

PREPARATION: 

1. Remove steering wheel center pad.
2. Disconnect the control switch connector.

CHECK: 

Measure resistance between terminals 2 and 3 of control switch connector when control switch is operated.

Fig 3: Checking Control Switch

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1. NG: Replace control switch. 
2. OK: Go to next step. 

1. NG: Repair or replace harness or connector. 
2. OK: Go to next step. 

1. OK: Wait and see. 
2. NG: Check and replace cruise control ECU (See  HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS  ).