Inspection Procedure

INSPECT CRUISE CONTROL MAIN SWITCH

Disconnect the cruise control main switch connector.

Fig 1: Identifying Cruise Control Main Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard:

RESISTANCE SPECIFICATIONS

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

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

Standard:

RESISTANCE SPECIFICATIONS

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

Measure the resistance between terminals 1 and 2 of the cruise control main switch connector when the mode switch is operated.

Standard:

RESISTANCE SPECIFICATIONS

Switch position	Tester connection	Specified value
MODE	1 - 2	Below 1 Ω

NG: REPLACE CRUISE CONTROL MAIN SWITCH (See REPLACEMENT )
OK: Go to next step.

CHECK WIRE HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - SPIRAL CABLE SUB-ASSY)

Turn the ignition switch OFF.

Fig 2: Checking Wire Harness And Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the cruise control main switch connector and spiral cable connector.

Check for an open circuit in harness and connector.

Standard:

TERMINAL NUMBER AND SPECIFIED CONDITION

Terminal No.	Specified value
A-1 - B-2	Below 1 Ω
A-3 - B-3	Below 1 Ω
A-4 - B-1	Below 1 Ω

Connect the spiral cable connector.

Check for a short circuit in harness and connector.

Standard:

TERMINAL NUMBER AND SPECIFIED CONDITION

Terminal No.	Specified value
B-2 - Body ground	10 kΩ or higher
B-3 - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: Go to next step.

INSPECT SPIRAL CABLE SUB-ASSY

Disconnect the spiral cable sub-assy connector.

Fig 3: Disconnecting Spiral Cable Sub-Assy Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance between terminals A and C13 of spiral cable sub-assy.

Standard:

RESISTANCE SPECIFICATIONS

Terminal No.	Specified value
A-1 - C13-7	Below 1 Ω
A-3 - C13-1	Below 1 Ω
A-4 - C13-2	Below 1 Ω

NG: REPLACE SPIRAL CABLE SUB-ASSY
OK: Go to next step.

CHECK WIRE HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSY - ECM)
1. Check for an open or short circuit in harness and connector between the spiral cable sub-assy and ECM (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
2. OK: Go to next step.
CHECK WIRE HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSY - BODY GROUND)
1. Check for an open circuit in harness and connector between the spiral cable sub-assy and body ground (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
2. OK: Go to next step.

INSPECT ECM

Remove the ECM with connector.

Fig 4: Identifying ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch ON.

Measure the voltage between terminal CCS (E6-24) of ECM and body ground, according to the cruise control main switch position as shown in the chart below.

Standard:

VOLTAGE SPECIFICATIONS

Switch position	Specified value
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 5: Identifying E7 Connector Terminals

Measure the voltage between terminal CCHG (E7-28) of ECM and body ground, according to the cruise control main switch position as shown in the chart below.

Standard:

VOLTAGE SPECIFICATIONS

Switch position	Specified value
MODE	Below 1 V
Neutral	10 to 14 V

NG: REPLACE ECM (See REPLACEMENT )
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE