10.2.4.6 DTC B1207 B1208 

Fault diagnosis code Descriptions 

B1207 

Left front/left rear steering lamp with an open circuit 

B1208 

Left front/ left rear steering lamp short circuit to grounding fault 

Circuit diagram: 

NL11-3210b

6 SO31

3 SO31

8 CA12

8 IP48

9 IP48

5 CA12

8 CA18

5 CA18

6 SO24

3 SO24

左后组合灯
(左转向灯)

左前组合大灯
(左转向灯）

右前组合大灯
(右转向灯）

右后组合灯
(右转向灯）

BCM

TURN-LH LAMP

TURN-RH LAMP

 

Diagnostic Steps: 

1 

Check any fault code except forB1207 B1208 

(a)  Check if any fault code exist except for B1207 B1208 

 

 

 

 

2 

Measure left steering lamp voltage. 

Yes 

Go to 

(DTC) list in 10.2.4.2

 and repair according 

to trouble codes. 

No 

Left rear 

combinati

on lamp 

(left 

steering 

lamp) 

Left front 

combination 

headlamp 

(left steering 

lamp) 

Right front 

combinati

on 

headlamp 

(Right 

steering 

lamp)

Right 

rearcombina

tion lamp 

(Right 

steering 

lamp) 

1907

 
 

(a)  Turn the ignition switch to ON position. 

(b)  Turn on the left steering lamp. 

(c)  Measure voltage value of left front steering lamp 

harness connector CA12 terminal8, left rear 
steering lamp harness connector SO31 terminal6.

Standard Voltage: 11-14 V 

Confirm if the voltage conforms to standard value. 

9

6

5

1

2

3

4

7

8

1

2

3

4

5

6

CA12左前组合灯线束连接器

IP48BCM线束连接器

SO31左后组合灯线束连接器

NL11-3212b

1 2 3

4 5 6

7 8 9

10 11 12 13

 

 

 

 

3 

Inspect the bulb. 

(a)  Check if the bulb of turning light is blown. 

Confirm whether the license plate lamp bulb is blown out. 

 

 

 

 

4 

Inspect the communication among the BCM, the left front steering lamp and the left rear steering 
lamp. 

 

No 

Go to step 4 

Yes 

Yes 

Replace the bulb . 

No 

IP48BCMharness connector

 

CA12 left front combination lamp harness connector

 

SO31 left rear combination lamp harness connector

 

1908

 
 

(a)  Turn the ignition switch to OFF position. 

(b)  Disconnect BCM harness connector IP48. 

(c)  Disconnect the steering lamp harness connector 

CA12、SO31. 

(d)  Measure resistance between BCM wire harness 

connector IP48 terminal 8 and license lamp wire 
harness connector CA12 terminal 5. 

(e)  Measure resistance between BCM wire harness 

connector IP48 terminal 8 and license lamp wire 
harness connector SO31 terminal 3. 

Standard Resistance: Less than 1 Ω 

Confirm if the resistance conforms to standard value. 

9

6

5

1

2

3

4

7

8

1

2

3

4

5

6

CA12左前组合灯线束连接器

IP48BCM线束连接器

SO31左后组合灯线束连接器

NL11-3212b

1 2 3

4 5 6

7 8 9

10 11 12 13

 

 

 

 

5 

Inspect the communication among the left front steering lamp, the left 
rear steering lamp and grounding. 

No 

Repair or replace the harness. 

Yes 

IP48BCMharness connector

 

CA12 left frontcombination lamp harness connector

 

SO31 left rear combination lamp harness connector

 

1909

 
 

(a)  Disconnect steering lamp harness 

connector CA12, SO31. 

(d) Measure the resistance between 

terminal 8 of license lamp harness 
connector CA12 and grounding. 

(c)  Measure resistance value between 

license lamp harness connector 
SO31 terminal6 and grounding. 

Standard Resistance: Less than 1 Ω 

(d) Measure the resistance between 

terminal 5 of license lamp harness 
connector CA12 and grounding. 

(e)  Measure resistance value between 

license lamp harness connector 
SO31 terminal3 and grounding. 

Standard Resistance: More than 10 Ω or 
higher 

Confirm if the resistance conforms to 

standard value. 

9

6

5

1

2

3

4

7

8

1

2

3

4

5

6

CA12左前组合灯线束连接器

SO31左后组合灯线束连接器

NL11-3213b

 

 

 

 

 

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. 

 

No 

Repair or replace the harness. 

Yes 

Next 

CA12 left front combination lamp harness connector

 

SO31 leftrear combination lamp harness connector

 

1910