Inspection Procedure

Check voltage between terminal CCS of ECM connector and body ground.
PREPARATION:
1. Remove the ECM with connector being connected.
2. Turn ignition switch ON.
Fig 1: Checking Voltage Between Terminal CCS Of ECM Connector And Body Ground
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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 2: Voltage Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Proceed to next circuit inspection shown on problem symptom table (See PROBLEM SYMPTOMS TABLE ).
2. NG: Go to Next Step
Check main switch continuity.
PREPARATION:
1. Remove steering wheel center pad (See STEERING WHEEL ).
2. Disconnect the control switch connector.
Fig 3: Checking Main Switch Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK:
1. Measure resistance between terminals 4 and 5 of cruise control switch connector when control switch is operated.
  
  Fig 4: Resistance Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check continuity between terminal 4 and 5 of the control switch connector when the main switch is held on and off.
OK:

Fig 5: Switch Position Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace control switch.
2. OK: Go to next step
Check harness and connector between ECM and cruise control switch, cruise control switch and body ground (See HOW TO PROCEED WITH TROUBLESHOOTING ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step
Check cruise control indicator light (See combination meter.)
1. NG: Replace combination meter.
2. OK: Check and replace ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).