Inspection Procedure

1. Remove the ECU-IG fuse from the instrument panel J/B.
2. Check the continuity of the ECU-IG fuse.

   OK: Continuity 

Fig 1: Inspecting Fuse (ECU-IG)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUSE 

OK: GO TO NEXT STEP 

1. Remove the cruise control ECU assembly with connector still connected.
2. Turn the ignition switch to ON.
3. Measure voltage between terminals 2 (B) and 16 (GND) of the cruise control ECU assembly connector.

   OK: Voltage: 10 to 16 V 

Fig 2: Inspecting Terminal Voltage (B)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: GO TO NEXT STEP 

1. Measure resistance between terminal 16 (GND) of the cruise control ECU assembly connector and body ground.

   OK: Resistance: Below 1 Ω 

Fig 3: Checking Harness And Connector (Cruise Control ECU Assembly - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPAIR HARNESS AND CONNECTOR (CRUISE CONTROL ECU ASSEMBLY - BATTERY)