Inspection Procedure

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

INSPECT STEERING PAD SWITCH CABLE

Fig 1: Identifying Steering Pad Switch Cable Distance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the steering pad switch cable.

Measure the resistance of the switch cable connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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 2: 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 of the switch cable connector.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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: REPLACE STEERING PAD SWITCH RH

OK: GO TO Next Step

INSPECT STEERING PAD SWITCH LH

Fig 3: 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 of the switch cable connector.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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: REPLACE STEERING PAD SWITCH LH

OK: GO TO Next Step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Disconnect the A and K20 spiral cable connectors.

Measure the resistance of the spiral cable connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
A-4 (DIST) - K20-11 (DIST)	Below 1 Ω
A-6 (ECC) - K20-2 (ECC)	Below 1 Ω

Fig 4: Identifying A And K20 Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK: GO TO Next Step

CHECK WIRE HARNESS (DISTANCE CONTROL ECU - SPIRAL CABLE AND BODY GROUND)

Disconnect the K13 ECU connector.
Disconnect the K20 spiral cable connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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

Fig 5: Identifying K13 ECU And K20 Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO Next Step

CHECK WIRE HARNESS (SPIRAL CABLE - BODY GROUND)

Disconnect the K20 spiral cable connector.

Measure the resistance of the wire harness side connector.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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

Fig 6: Identifying K20 Spiral Cable Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO Next Step

CHECK DISTANCE CONTROL ECU (CRUISE CONTROL ECU)

Remove the distance control ECU (cruise control ECU) with the connector.
Turn the power switch ON (IG).

Measure the voltage of the connector.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

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

Fig 7: Identifying K13 Distance Control ECU (Cruise Control ECU) Connector Terminals

NG: REPLACE DISTANCE CONTROL ECU (CRUISE CONTROL ECU)

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