Lexus ES: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

PRE-CHECK

(a) Measure the auxiliary battery voltage with the power switch off.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

3.	CHECK CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check that the CAN communication system is functioning normally.

Click here

OK:

CAN communication system is functioning normally.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

4.	CHECK FOR DTCs*

(a) Check for DTCs.

Body Electrical > Front Radar Sensor > Trouble Codes

(b) Make a note of any DTCs that are output.

Result	Proceed to
DTCs are not output	A
DTC C1A1100 is output	B
DTCs other than C1A1100 are output	C

B

GO TO DTC CHART (C1A1100)

C

GO TO STEP 7

A

5.	CHECK VEHICLE CONTROL HISTORY*

(a) Using the Techstream, check for Vehicle Control History.

Body Electrical > Front Radar Sensor > Utility

Tester Display
Vehicle Control History (RoB)

(b) Record any output Vehicle Control History.

Result	Proceed to
Vehicle Control History codes are not output	A
Vehicle Control History code X2026 or X2028 is output	B
Vehicle Control History codes other than X2026 and X2028 are output	C

A

GO TO SYMPTOM SIMULATION

B

GO TO VEHICLE CONTROL HISTORY (X2026 or X2028)

C

6.	RECONFIRM VEHICLE CONTROL HISTORY*

(a) Using the Techstream, clear the Vehicle Control History.

Body Electrical > Front Radar Sensor > Utility

Tester Display
Vehicle Control History (RoB)

(b) Using the Techstream, check for Vehicle Control History.

Body Electrical > Front Radar Sensor > Utility

Tester Display
Vehicle Control History (RoB)

Result	Proceed to
Vehicle Control History codes are not output	A
Vehicle Control History codes are output	B

A

GO TO SYMPTOM SIMULATION

B

GO TO VEHICLE CONTROL HISTORY

7.	RECONFIRM DTC OUTPUT*

(a) Clear the DTCs.

Body Electrical > Front Radar Sensor > Clear DTCs

(b) Reproduce the vehicle conditions that were present when the DTCs that were noted were stored.

HINT:

Refer to each corresponding DTC for details on the detection conditions.

Click here

(c) Recheck for DTCs.

Body Electrical > Front Radar Sensor > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

A

GO TO STEP 5

B

GO TO DTC CHART

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