Toyota CH-R Service Manual: Lost Communication With Headlamp Control Module "B" (U0242)

Toyota CH-R Service Manual / Lighting (ext) / Lighting System / Lost Communication With Headlamp Control Module "B" (U0242)

DESCRIPTION

The headlight ECU sub-assembly LH stores this DTC when the headlight ECU sub-assembly RH detects an internal malfunction or if a communication malfunction occurs between headlight ECU sub-assembly LH and headlight ECU sub-assembly RH for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

U0242

Lost Communication With Headlamp Control Module "B"

Any of the following conditions is met:

  • Headlight ECU sub-assembly RH internal malfunction
  • Communication malfunction occurs between headlight ECU sub-assembly LH and headlight ECU sub-assembly RH for 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Headlight ECU sub-assembly RH
  • Harness or connector

-

DTC Detection Conditions:
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

Ignition switch ON

Malfunction Status

Headlight ECU sub-assembly RH internal malfunction

-

Communication malfunction occurs between headlight ECU sub-assembly LH and headlight ECU sub-assembly RH

-

Detection Time

-

10 seconds or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Check for DTCs.

Click here

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC U0242 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Disconnect the A16 headlight ECU sub-assembly LH connector.

(b) Disconnect the A17 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A16-20 (LINL) - A17-20 (LINL)

Always

Below 1 Ω

A16-20 (LINL) or A17-20 (LINL) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Replace the headlight ECU sub-assembly RH with a new or known good one.

Click here

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > HL AutoLeveling > Clear DTCs
NEXT

6.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Check for DTCs.

Click here

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC U0242 is not output.

OK

END (HEADLIGHT ECU SUB-ASSEMBLY RH WAS DEFECTIVE)

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

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