Inspection Procedure

1. See input signal check (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).
2. Check the indicator light operation when each of the SET/COAST, RESUME/ACCEL and CANCEL is turned ON.

   OK: SET/COAST, RESUME/ACCEL switch: 

   The signals shown in  Fig 1  should be output when each switch is ON. The signal should disappear when the switch is turned OFF. 

   CANCEL switch: 

   The indicator light goes off when the cancel switch is turned ON. 

Fig 1: Checking Input Signal Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: WAIT AND SEE 

NG: GO TO NEXT STEP 

1. Remove the cruise control ECU assembly with the connector being connected.
2. Turn the ignition switch to ON.
3. Measure the voltage between terminals 11 (CCS) of the cruise control ECU assembly connector and the body ground when each control switch is operated.

   OK 

   TERMINAL VOLTAGE (CCS)
   
   

   Switch Position	Voltage
   Neutral	10 to 16 V
   CRUISE ON-OFF	Below 0.5 V
   RES/ACC	2.3 to 4.5 V
   SET/COAST	4.5 to 8.1 V
   CANCEL	6.6 to 11.4 V

   Fig 2: Inspecting Terminal Voltage (CCS)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: GO TO NEXT STEP 

1. Remove the steering wheel center pad (See REMOVAL ).
2. Disconnect the control switch assembly connector.
3. Check continuity between terminals 2 (CCS) and 3 (ECC) of control switch assembly connector when cruise control main switch assembly is held ON and OFF.

   OK 

   CRUISE CONTROL MAIN SWITCH ASSEMBLY
   
   

   Switch Position	Resistance
   Neutral	Infinity (No continuity)
   CRUISE ON-OFF	0 Ω (Continuity)
   RES/ACC	210 to 270 Ω
   SET/COAST	560 to 700 Ω
   CANCEL	1,380 to 1,700 Ω

   Fig 3: Inspecting Cruise Control Main Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CRUISE CONTROL MAIN SWITCH ASSEMBLY 

OK: GO TO NEXT STEP 

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

OK: WAIT AND SEE 

NG: CHECK AND REPLACE CRUISE CONTROL ECU ASSEMBLY