Inspection Procedure

1. Disconnect the cruise control main switch connector.
2. Measure the resistance between terminal 1 and 3 of the cruise control main switch connector when the cruise control main switch is operated.

   Resistance 

   TERMINAL 1 AND 3 (RESISTANCE)
   
   

   Switch position	Resistance (Ω)
   Neutral	10 kΩ or higher
   +/RES	210 to 270
   -/SET	560 to 700
   CANCEL	1,380 to 1,700

3. Check continuity between terminals 1 and 3 of cruise control main switch connector when the main switch is held on and off.

   Resistance 

   TERMINALS 1 AND 3 (CONTINUITY)
   
   

   Switch position	Tester connection	Specification
   OFF	1 - 3	10 kΩ or higher
   ON	1 - 3	Below 1 Ω

4. Check continuity between terminals 1 and 2 of cruise control main switch connector when the mode switch is operated.

   Resistance 

   TERMINALS 1 AND 2 (CONTINUITY)
   
   

   Switch position	Tester connection	Specification
   MODE	1 - 2	Below 1 Ω

   Fig 1: Inspecting Cruise Control Main Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CRUISE CONTROL MAIN SWITCH 

OK: GO TO NEXT STEP 

1. Check for an open or short circuit in harness and connector between cruise control main switch and ECM (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Check for an open or short circuit in harness and connector between cruise control main switch and body ground (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Remove the ECM with connector.
2. Turn the ignition switch ON.
3. Measure the voltage between terminal CCS (E5-24) of ECM and body ground, when cruise main switch is operated.

   Voltage 

   CCS (E5-24) AND BODY GROUND
   
   

   Switch position	Voltage
   Neutral	10 to 16 V
   CANCEL	6.6 to 10.1 V
   -/SET	4.5 to 7.1 V
   +/RES	2.3 to 4.0 V
   Main switch ON	Below 1 V

   Fig 2: Measuring Voltage Between CCS (E5-24) And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the voltage between terminal CCHG (E6-28) of ECM and body ground, when cruise control main switch is operated.

   Voltage 

   CCHG (E6-28) AND BODY GROUND
   
   

   Switch position	Voltage
   MODE	Below 1 V
   Neutral	10 to 14 V

   Fig 3: Measuring Voltage Between Terminal CCHG (E6-28) And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE