10.3.3.5 DTC B11B312. B11B312 

Fault diagnosis code Descriptions 

B11B412 

Anti-Theft LED Circuit Fault 

B11B411 

Anti-Theft LED Circuit Fault 

Circuit diagram: 

NL11-0016c

BCM

1

ALM LED

IP14

2 IP14

23 IP61

防盗报警灯

 

Diagnostic Steps: 

1 

Inspect whether there is any DTC Code other than B11B412/B11B411. 

(a)  Inspect whether there is any DTC Code other than B11B412/B11B411. 

 

 

 

 

2 

Measure voltage between the alarm indicator harness connector IP14 terminal 2.and 1. 

No 

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

Yes 

Anti-theft alarm lamp

 

1983

 
 

(a) Disconnect the anti-theft indicator harness 

connector IP14. 

(b)  Measure voltage between terminal 2 and 1 with a 

universal meter. 

Standard Voltage: 11-14 V 

Confirm if the voltage conforms to standard value. 

NL11-0173b

2

6

5

4

3

1

IP14 防盗报警灯线束连接器

 

 

 

 

3 

Check ground circuit of anti-theft indicator. 

 

(a) Disconnect the anti-theft indicator harness 

connector IP14. 

(b) Measure voltage between harness connector 

terminal 1 and vehicle body ground point with a 
universal meter. 

Standard Resistance: Less than 1 Ω 

Confirm whether the resistance is at a specified value. 

NL11-0173b

2

6

5

4

3

1

IP14 防盗报警灯线束连接器

 

 

 

 

4 

Repair ground circuit of anti-theft indicator. 

a)  Repair fault point from anti-theft indicator to body ground circuit. 

Is the anti-theft indicator working correctly? 

 

Yes 

Go to step 7 

No 

Yes 

Go to step 4 

No 

Yes 

The system is normal. 

IP14 anti-theft alarm lamp harness connector

 

IP14 anti-theft alarm lamp harness connector

 

1984

 
 

 

 

5 

Check supply circuit of anti-theft indicator. 

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

(b)  Disconnect the battery negative cable. 

(c)  Disconnect BCM harness connector IP61. 

(d)  Disconnect the anti-theft indicator harness connector. 

(e)  Measure the resistance between terminal 2 of anti-theft indicator harness connector IP14 and BCM harness 

connector IP61 with a universal meter. 

Specified Value of Test Project 

Specified Value of Test Project 

IP61(23)—IP14(2)  

Less than 1 Ω 

Is the resistance at a specified value? 

 

 

 

 

6 

Replace the BCM 

(a)  Replace BCM and refer to Replacement of BCM in 11.8.8.1. 

Is the anti-theft indicator working correctly? 

 

 

 

7 

Replace the anti-theft indicator. 

(a) Replace 

anti-theft 

indicator 

and refer to 11.8.8.2 "Replacement of Anti-theft Indicator". 

Confirm the completion of repair. 

 

 

 

8 

The system is normal. 

Next 

No 

No 

Repair open circuit fault between terminal 2 of 
anti-theft indicator harness connector IP14 and 
BCM harness connector IP61 

Yes 

Yes 

The system is normal. 

No 

1985

 
 

 

10.3.3.6 DTC B11B512. B11B512 

Fault diagnosis code Descriptions 

B11B512 

Key Illumination Light Circuit Fault 

B11B511 

Key Illumination Light Circuit Fault 

Circuit diagram: 

NL11-0017c

BCM

3 IP43

4 IP43

10 IP63

防盗报警灯

 

1 

Inspect whether there is any DTC Code other than B11B512/B11B511. 

(a)  Inspect whether there is any DTC Code other than B11B512/B11B511. 

 

 

 

 

2 

Measure the voltage of anti-theft alarm light. 

No 

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

Yes 

Anti-theft alarm lamp

 

1986