Diagnostic Procedure

DTC U0420:00 (RADAR UNIT) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	PERFORM DTC INSPECTION FOR EPS CONTROL MODULE Perform the EPS control module DTC inspection using the M-MDS. (See DTC INSPECTION [EPS CONTROL MODULE] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [EPS CONTROL MODULE] .) Then go to Step 3.
1		No	Go to the next step.
2	PERFORM DTC INSPECTION FOR RADAR UNIT Clear radar unit DTCs using the M-MDS. (See CLEARING DTC (RADAR UNIT) .) Switch the ignition ON (engine on). Perform the radar unit DTC inspection using the M-MDS. (See DTC INSPECTION (RADAR UNIT) .) Is the same DTC present?	Yes	Replace the EPS control module, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
2		No	Go to Step 4.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear radar unit DTCs using the M-MDS. (See CLEARING DTC (RADAR UNIT) .) Switch the ignition ON (engine on). Perform the radar unit DTC inspection using the M-MDS. (See DTC INSPECTION (RADAR UNIT) .) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction does not recur, go to the next step. If the malfunction recurs, replace the radar unit. (See RADAR UNIT REMOVAL/INSTALLATION .) Go to the next step.
3		No	Go to the next step.
4	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
4		No	DTC troubleshooting completed.