10.2.4.11 DTC B1237 

Fault diagnosis code Descriptions 

B1237 

Sunlight sensor fault 

Circuit diagram: 

CA18

6 CA12

5 CA12

16 IP42

13 IP42 14 IP42 6 IP42

5 IP49

40 IP50

2 IP05

1 IP05

3 IP05

26 IP50 7 IP50

近光灯
继电器

灯光
组合
开关

右前
组合
大灯

左前
组合
大灯

远光

近光

远光

近光

阳光传感器

6 CA18

5

OFF

位置灯

近光

远光

超车灯

自动

7

13

8

14

16

6

5

2

1

3

+B

IG1

ER01

15

A

EF

26

10

A

IF

25

BCM

NL11-3242b

 

Diagnostic Steps: 

1 

Inspect whether there is any DTC Code other than B1237 

(a)  Inspect whether there is any DTC Code other than B1237. 

 

 

 

 

2 

Inspect the communication between the sunlight sensor and 
the fuse. 

Yes 

Go to 

DTC list in 10.2.4.2

 and repair according to 

trouble codes. 

No 

Solar sensor 

Low beam 
lamp relay 

ER01

Position lamp

Low beam

High beam

Overtake lamp

Auto

Lighting 

combination 

switch

Left front co

mbinati

on 

headlamp

 

Right front

 

combinatio

n headla

mp

 

High beam

low beam 

High beam 

low beam

1923

 
 

(a)  Rotated ignition switch to "OFF" position . 

(b)  Disconnect solar sensor harness connector 

IP05. 

(c) Measure resistance value between solar 

sensor harness connector IP05 terminal3 and 
indoor fuseIF25. 

Standard Resistance: Less than 1 Ω 

Confirm whether the resistance is normal. 

NL11-3244b

3

2

1

IP05阳光传感器线束连接器

 

 

 

 

 

3 

Inspect the communication between the sunlight sensor and 
the grounding. 

(a)  Measure resistance between sun sensor 

wire harness connector IP05 terminal 1 and 
grounding. 

Standard Resistance: Less than 1 Ω 

(b)  Measure resistance value between solar 

sensor harness connector IP05 terminal3 
and grounding 

(c) Measure resistance value between of 

resistance value between solar sensor 
harness connector IP05 terminal2 and 
grounding. 

Standard Resistance: 10 kΩ or higher 

Confirm if the resistance conforms to standard 

value. 

NL11-3245b

3

2

1

IP05阳光传感器线束连接器

 

 

 

 

 

4 

Communication between the sunlight sensor and the 
BCM. 

No 

Repair or replace the harness. 

Yes 

No 

Repair or replace the harness. 

Yes 

IP05 solar sensorharness connector

 

IP05 solar sensorharness connector

 

1924

 
 

(a)  Turn the ignition switch to OFF position. 

(b)  Disconnect BCM harness sensor IP50. 

(c)  Measure solar sensor harness connector IP05 

terminal2 and BCM harness connector 

Resistance of IP50 terminal and No.40 

Standard Resistance: Less than 1 Ω 

(d)  Measure resistance between BCM wire harness 

connector IP50 terminal 40 and grounding. 

Standard Resistance: 10 kΩ or higher 

Confirm if the resistance conforms to standard value.

NL11-3246b

3

2

1

IP05阳光传感器线束连接器

IP50BCM线束连接器

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

 

 

 

 

5 

Replace solar 
sensor, 

(a)  Replace solar sensor, refer to

11.3.8.16 ambient light and solar sensor replacement

. 

(b)  Clear DTC, and read again. 

Standard Resistance: Less than 1 Ω 

(c)  Measure resistance value between front celling lamp harness connector RF12 terminal2 

and grounding 

(d)  Measure resistance between front dome lamp wire harness connector RF12 terminal 3 

and grounding. 

Confirm whether the fault code still exists. 

 

 

 

 

6 

Replace the BCM 

(a)  Replace BCM and refer to 

Replacement of BCM in 11.8.8.1

. 

Confirm the completion of repair. 

 

 

7 

The system is normal. 

Next 

No 

Repair or replace the harness. 

Yes 

No 

The system is normal. 

Yes 

IP05 solar sensorharness connector

 

IP50BCMharness connector

 

1925

 
 

10.2.4.12 DTC B1213 

Fault diagnosis code Descriptions 

B1213   

If not detecting the stop bit signal within 8S consecutively the front wiper faults.

Circuit diagram: 

20A

IF30

IG1继电器

前雨刮电机

2 CA14

4

3 CA14

1 CA14

12 IP48

BCM

13 IP48

11 IP48

WIPER

GND

9 IP47

WIPEP

POWEP

HIGHT

WIPER

LOW

WIPER

CA14

M

NL11-3247b

 

Diagnostic Steps: 

1 

Inspect whether there is any DTC Code other than B1213. 

(a)  Inspect whether there is any DTC Code other than B1213. 

 

 

 

2 

Inspect the communication between the wiper motor and the BCM. 

 

Yes 

Go to DTC list in 10.2.4.2 and repair according to 
trouble codes. 

No 

IG1 RELAY 

Front wiper 

motor

 

1926