Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Back-up Light Circuit

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/ Afs) / Back-up Light Circuit

DESCRIPTION

The hybrid vehicle control ECU controls the back-up lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

READ VALUE USING GTS

(a) Turn the ignition switch to ON.

(b) Move the shift lever to R.

(c) Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Normal Condition

Reference Value

Diagnostic Note

Back-up Light Fuse Shut Off Status

Back-up light fuse shut off status

OFF or ON

OFF: Fuse has no shut off history

ON: Fuse has shut off history

-
Body Electrical > Power Distribution Box > Data List

Tester Display

Back-up Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

NG

GO TO STEP 7

OK

2.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Normal Condition

Reference Value

Diagnostic Note

Back-up Light Input Signal

Back-up light input

OFF or ON

OFF: Shift lever in any position other than R

ON: Shift lever in R

-
Body Electrical > Power Distribution Box > Data List

Tester Display

Back-up Light Input Signal

OK:

Display changes according to shift lever operation.

NG

GO TO STEP 5

OK

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8J power distribution box assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

8J-1 - Body ground

Ignition switch off

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the U9 rear light assembly RH connector.

(b) Disconnect the U10 rear light assembly LH connector.

(c) Disconnect the 8F power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

U9-2 (B) - 8F-38

Always

Below 1 Ω

U10-2 (B) - 8F-38

Always

Below 1 Ω
OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the I249 hybrid vehicle control ECU connector.

(b) Disconnect the 8B power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I249-24 (BL) - 8B-30

Always

Below 1 Ω

I249-24 (BL) - Body ground

Always

10 kΩ or higher

8B-30 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HYBRID VEHICLE CONTROL ECU (OUTPUT VOLTAGE)

(a) Connect the I249 hybrid vehicle control ECU connector.

*a

Component with harness connected

(Power Distribution Box Assembly)

(b) Connect the 8B power distribution box assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

8B-30 - Body ground

Ignition switch ON, reverse (R) not selected

Below 1 V

8B-30 - Body ground

Ignition switch ON, reverse (R) selected

11 to 14 V
OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPLACE HYBRID VEHICLE CONTROL ECU

for 2ZR-FXE: Click here

for M20A-FXS: Click here

7.

CHECK REAR LIGHT ASSEMBLY LH

(a) Disconnect the U10 rear light assembly LH connector.

(b) Turn the ignition switch to ON.

(c) Move the shift lever to R.

(d) Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Normal Condition

Reference Value

Diagnostic Note

Back-up Light Fuse Shut Off Status

Back-up light fuse shut off status

OFF or ON

OFF: Fuse has no shut off history

ON: Fuse has shut off history

-
Body Electrical > Power Distribution Box > Data List

Tester Display

Back-up Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

OK

REPLACE REAR LIGHT ASSEMBLY LH

NG

8.

CHECK REAR LIGHT ASSEMBLY RH

(a) Disconnect the U9 rear light assembly RH connector.

(b) Turn the ignition switch to ON.

(c) Move the shift lever to R.

(d) Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Normal Condition

Reference Value

Diagnostic Note

Back-up Light Fuse Shut Off Status

Back-up light fuse shut off status

OFF or ON

OFF: Fuse has no shut off history

ON: Fuse has shut off history

-
Body Electrical > Power Distribution Box > Data List

Tester Display

Back-up Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

OK

REPLACE REAR LIGHT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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