Inspection Procedure

PREPARATION: 

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

CHECK: 

Measure voltage between terminal CCS of ECM connector and body ground, when each of the -/SET, +RES and CANCEL is turned ON.

OK: 

Fig 1: Checking Voltage Between Terminal CCS Of ECM Connector & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Proceed to next circuit inspection shown on  PROBLEM SYMPTOMS TABLE   . 
2. NG: Go to next step. 

PREPARATION: 

1. Remove steering wheel center pad (See STEERING WHEEL ).
2. Disconnect the control switch connector.

CHECK: 

1. Measure resistance between terminals 4 and 5 of cruise control switch connector when control switch is operated.
   SWITCH POSITION VOLTAGE SPECIFICATION
   
   

   Switch position	Resistance (Ω)
   Neutral	infiniti (No continuity)
   +/RES	210 -- 270
   -/SET	560 -- 700
   CANCEL	1380 -- 1700

2. Check continuity between terminals 4 and 5 of control switch connector when main switch is held on and off.

   OK: 

   SWITCH TESTER CONNECTION SPECIFICATION
   
   

   Switch position	Tester connection	Specified condition
   OFF	4 -- 5	No continuity
   ON	4 -- 5	Continuity

   Fig 2: Checking Continuity Between Terminals 4 & 5 Of Control Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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. NG: Replace combination meter. 
2. OK: Check and replace ECM (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION  ).