Inspection Procedure

INSPECT FUSE (ECU-IG)
1. Remove the ECU-IG fuse from the instrument panel J/B.
  
  Fig 1: Identifying ECU-IG Fuse
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the continuity of the ECU-IG fuse.
OK: Continuity
1. NG: REPLACE FUSE
OK: Go To Next Step
INSPECT TERMINAL VOLTAGE (B)
1. Remove the cruise control ECU assy 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 assy connector.
Fig 2: Identifying Terminals (B) And (GND) Of Cruise Control ECU Assy Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go To Next Step

Voltage: 10-16 V
1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN ( PROBLEM SYMPTOMS TABLE )
NG: Go To Next Step
CHECK HARNESS AND CONNECTOR (BETWEEN CRUISE CONTROL ECU ASSY AND BODY GROUND)

Fig 3: Identifying Terminal (GND) Of Cruise Control ECU Assy Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Measure resistance between terminal 16 (GND) of the cruise control ECU assy connector and body ground.
OK: Go To Next Step

Resistance: Below 1 Ω
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go To Next Step

CHECK AND REPAIR HARNESS AND CONNECTOR BETWEEN CRUISE CONTROL ECU ASSY AND BATTERY