Inspection Procedure

PREPARATION: 

See the 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.

Fig 1: Indicator Light Operation Blinking Pattern When Each Of SET/COAST, RESUME/ACCEL & CANCEL Is Turned On

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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. 

OK: Wait and see. 

NG: Go to Next Step. 

Fig 2: Measuring Voltage Between Terminals 18 Of ECU Connector & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PREPARATION: 

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

CHECK: 

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

NG: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 

OK: Go to Next Step. 

PREPARATION: 

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

CHECK: 

Measure the resistance between terminals 3 and 4 of the control switch connector when the control switch is operated.

Fig 3: Measuring Resistance Between Terminals 3 & 4 Of Control Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Replace control switch. 

OK: Go to Next Step. 

NG: Repair or replace harness or connector. 

OK: Go to Next Step. 

OK: Wait and see. 

NG: Check and replace cruise control ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).