11.11 Defrost 

11.11.1 Specification 

11.11.1.1 Fastener specifications 

Torque range 

Fastener name 

Model 

Metric (N.m) 

English system 

(lb-ft) 

Self-tapping screw for defrosting 

switch 

ST4.2×13 2-4  4.5-3 

11.11.1.2 Defrost work condition requirement. 

State of ignition switch 

Battery voltage (V) 

Defrosting Operation 

Status 

OFF --- 

OFF 

ON 

＞

10.7 Normal 

ACC/ON/START 

＜

10.3 Stop 

working 

11.11.2 Description and operation 

11.11.2.1 Description and operation 

The defrosting system consists of the following main components: 

– Defrost 

switch 

– 

Left, right rearview mirror heater 

– 

Heater of rear backdoor glass 

The defrosting switch is located on the instrument panel central switch assembly, the back door 
window heater is located inside the back door window and the left and right rearview mirrors are 
integrated with a rearview mirror heater. 

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11.11.3 System work principle 

11.11.3.1 Work principle 

Install the backdoor window defrosting switch on the instrument panel center switch assembly. 
Transmit the defrosting request signal to the air conditioner control module which then receives 
the input signal for the defrosting switch to control the backdoor defrosting relay to close. The 
backdoor defrosting relay outputs power to the backdoor defrosting grille and left and right 
rearview mirror heaters and at the same time the rear defrosting/rearview mirror heating signal 
will be sent to the ECM via a dedicated line. The ECM will increase the RPM of the engine 
according to needs. Rear defrosting switch is an inching button switch, and rearview mirror 
heating switch is a gyration button. 

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11.11.4 Part position 

11.11.4.1 Component position 

Defrost grille of rear back-door glass 

1

NL11-2178b

 

1.  Defrost grille of rear back-door glass 

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11.11.5 Electrical schematic diagram 

11.11.5.1 Electrical schematic diagram 

NL11-2180b

IP27

11 IP27

12

35 EN01

4 IP06

5 IP06

1 IP06

3 IP06

10A

IF25

IG1

IPALT

87

85

30

86

30A

IF16

10A

IF18

1 SO47

1 SO42

H DR08

E DR08

H DR18

E DR18

左侧

车外后视镜

右侧

车外后视镜

后窗除雾

自动空调

后除霜开关

后除霜
继电器

AC(

手动空调)

IP16

22 IP16

7

AC(

自动空调）

ECM

空调控制面板

空调控制面板

 

Rear 
defrostrelay

Rear 
defrost 
switch 

A/C(manual air 

conditioning) air 

condition control panel 

Rear 
window 
defrost

Left side outer 
rearview mirror 

Rightside 
outer rearview 
mirror 

A/C(manual air 

conditioning) air 

condition control panel

Auto air conditioning

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