Inspection Procedure

Preparation 

See input signal check. See step  4 under PRECHECK.

Check 

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

Fig 1: Reading Input Signals For Cruise Control Switches

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: 

1. SET/COAST, RESUME/ACCEL switch 
   1. The signals shown in  Fig 1  should be output when each switch is ON. The signal should disappear when the switch is turned OFF  .
2. CANCEL switch 
   1. 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: Locating ECU Terminal CCS

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Cruise Control Switch Position Specifications

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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 4: Locating Cruise Control Switch Connector Terminals 3 & 4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Cruise Control Switch Connector Terminal 3 & 4 Specifications

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

1. OK: Wait and see.
2. NG: Check and replace cruise control ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .