PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for HV Model (w/o Safe Exit Assist Function)): C1AB4; Open in Outer Mirror Indicator(Master); 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001H93Q
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for HV Model (w/o Safe Exit Assist Function)): C1AB4; Open in Outer Mirror Indicator(Master); 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C1AB4

Open in Outer Mirror Indicator(Master)

DESCRIPTION

This DTC is stored when the blind spot monitor sensor LH detects an open in the outer rear view mirror indicator LH.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1AB4	Open in Outer Mirror Indicator(Master)	Both of the following conditions are met: The blind spot monitor system is on The current flowing to the indicator is below a specified value when indicator operation voltage is being sent to the indicator	Outer mirror LH Outer rear view mirror assembly LH Harness or connector Blind spot monitor sensor LH

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is turned on.

PROCEDURE

1.

CHECK DTC

(a) Turn the power switch off.

(b) Turn the power switch on (IG).

(c) Recheck for DTCs and check if the same DTC is output again.

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.	CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY LH - BLIND SPOT MONITOR SENSOR LH AND BODY GROUND)

(a) Disconnect the O57 blind spot monitor sensor LH connector.

(b) Disconnect the L9 outer rear view mirror assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O57-4 (OMIL) - L9-1 (BSL+)	Always	Below 1 Ω
L9-4 (E) - Body ground	Always	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH

(a) Disconnect the IND1 outer mirror LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L9-1 (BSL+) - IND1-2 (+)	Always	Below 1 Ω
L9-4 (E) - IND1-1 (-)	Always	Below 1 Ω

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

OK

4.	INSPECT OUTER MIRROR LH

(a) Remove the outer mirror LH.

Click here

(b) Inspect the outer rear view mirror indicator LH on the outer mirror LH.

Click here

OK

REPLACE BLIND SPOT MONITOR SENSOR LH

NG

REPLACE OUTER MIRROR LH