Inspection Procedure

PREPARATION:

See input signal check on PRE-CHECK .

CHECK:

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

Fig 1: Input Signal & Indicator Light Blinking Pattern Table

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OK:

1. SET/COAST, RESUME/ACCEL switch 
2. The signals shown in the table on the left should be output when each switch is ON. The signal should disappear when the switch is turned OFF. 
3. CANCEL switch 
4. The indicator light goes off when the cancel switch is turned ON. 

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

Fig 2: Measuring Voltage Between Terminal 18 & Body Ground

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1. NG : Proceed to next circuit inspection shown on 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 3 and 4 of control switch connector when control switch is operated.

Fig 3: Measuring Control Switch Terminal Resistance

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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 USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).