Distance Control Switch Circuit: Wiring Diagram

Fig 1: Distance Control Switch Circuit - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: When the distance control ECU is replaced with a new one, initialization must be performed (see CRUISE CONTROL MAIN SWITCH ).

INSPECT STEERING PAD SWITCH CABLE

Fig 2: Identifying Steering Pad Switch Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the steering pad switch cable.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1 (DIST) - 1 (DIST)	Below 1 Ω
7 (ECC) - 7 (ECC)	Below 1 Ω

NG : REPLACE STEERING PAD SWITCH CABLE

OK : GO TO NEXT STEP

INSPECT STEERING PAD SWITCH RH

Fig 3: Identifying Steering Pad Switch RH Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the steering pad switch cable to the steering pad switch RH.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
1 (DIST) - 7 (ECC)	Distance control switch ON	Below 2.5 Ω
1 (DIST) - 7 (ECC)	Distance control switch OFF	10 kΩ or higher

NG : REPAIR OR REPLACE STEERING PAD SWITCH RH

OK : GO TO NEXT STEP

INSPECT STEERING PAD SWITCH LH

Fig 4: Identifying Steering Pad Switch LH Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the steering pad switch RH and the steering pad switch cable to the steering pad switch LH.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A-4 (DIST) - A-6 (ECC)	Distance control switch ON	Below 2.5 Ω
A-4 (DIST) - A-6 (ECC)	Distance control switch OFF	10 kΩ or higher

NG : REPAIR OR REPLACE STEERING PAD SWITCH LH

OK : GO TO NEXT STEP

INSPECT SPIRAL CABLE

Disconnect the spiral cable connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
A-4 - K20-11	Below 1 Ω
A-6 - K20-2	Below 1 Ω

NG : REPLACE SPIRAL CABLE

Fig 5: Identifying Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP

CHECK WIRE HARNESS (DISTANCE CONTROL ECU - SPIRAL CABLE)

Disconnect the distance control ECU connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
K20-11 (DIST) - K13-16 (MODE)	Below 1 Ω
K13-16 (MODE) - Body ground	10 kΩ or higher

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR

Fig 6: Identifying Distance Control ECU - Spiral Cable Connector Terminals

OK : GO TO NEXT STEP

CHECK WIRE HARNESS (SPIRAL CABLE - BODY GROUND)

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
K20-2 (ECC) - Body ground	Below 1 Ω

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR

Fig 7: Identifying Spiral Cable - Body Ground Connector Terminals

OK : GO TO NEXT STEP

INSPECT DISTANCE CONTROL ECU

Remove the distance control ECU (cruise control ECU) with the connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
K13-16 (MODE) - K13-12 (GND)	Distance control switch ON	0 to 2 V
K13-16 (MODE) - K13-12 (GND)	Distance control switch OFF	9 to 16 V

NG : REPLACE DISTANCE CONTROL ECU

Fig 8: Identifying Distance Control ECU Connector Terminals

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