Distance Control ECU Power Source Circuit

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Distance Control ECU Power Source Circuit
- Distance Control ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the distance control ECU. The distance control ECU determines information about the vehicle in front based on data from the radar sensor, and then decides how much acceleration and/or deceleration is needed to maintain the set distance. The distance control ECU also requests the skid control ECU to apply braking and to sound the buzzer.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - BODY GROUND)

(a) Disconnect the distance control ECU connector.





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

Standard Resistance:





Text in Illustration





(c) Reconnect the distance control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. CHECK DISTANCE CONTROL ECU (+B VOLTAGE)

(a) Disconnect the distance control ECU connector.





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

Standard Voltage:





Text in Illustration





(c) Reconnect the distance control ECU connector.

NG -- INSPECT IG1 RELAY

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Dynamic Radar Cruise Control System

3. INSPECT IG1 RELAY

(a) Remove the IG1 relay from the instrument panel J/B.





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

Standard Resistance:





(c) Reinstall the IG1 relay.

NG -- REPLACE IG1 RELAY
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - INSTRUMENT PANEL J/B)

(a) Disconnect the distance control ECU connector.

(b) Remove the IG1 relay from the instrument panel J/B.

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

Standard Resistance:





(d) Reinstall the IG1 relay.

(e) Reconnect the distance control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DISTANCE CONTROL ECU - INSTRUMENT PANEL J/B)
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (IG1 RELAY POWER SOURCE CIRCUIT)

(a) Remove the IG1 relay from the instrument panel J/B.





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

Standard Voltage:





Text in Illustration





(c) Reinstall the IG1 relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 RELAY POWER SOURCE CIRCUIT)
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (IG1 RELAY - BODY GROUND)

(a) Remove the IG1 relay from the instrument panel J/B.





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

Standard Resistance:





Text in Illustration





(c) Reinstall the IG1 relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 RELAY - BODY GROUND)
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (IG1 RELAY - MAIN BODY ECU)

(a) Disconnect the main body ECU connector.

(b) Remove the IG1 relay from the instrument panel J/B.

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

Standard Resistance:





(d) Reconnect the main body ECU connector.

(e) Reinstall the IG1 relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 RELAY - MAIN BODY ECU)

OK -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START Problem Symptoms Table