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Volume 4

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LOCATION:    12.8 Mirror, Steering Column Adjustment, Heated Mirrors (MSC)  >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope Test connection Test condition Nominal value Possible cause/ Remedy
1.0 Center console switch
group (S21)
Voltage supply

A
(1)
S21

G
(4)
Ignition: OFF
Do not disconnect connectors 1 and 4
11 - 14 V Wiring,
S21
2.0 Outside rearview mirror-left/right switch (S21s8)
Function

E
(4)
S21



G
(4)
Ignition: OFF
Disconnect connector 4
Set S21s8 to left mirror.

Press outside rearview mirror-horizontal adjustment switch (S21s7) to the left:

Press outside rearview mirror-horizontal adjustment switch (S21s7) to the right:







< 1




>20 k
2.1
2.1 Outside rearview mirror-left/right switch (S21s8)
Function

F
(4)
S21



G
(4)
Ignition: OFF
Disconnect connector 4
Set S21s8 to right mirror.

Press (S21s7) to the left:

Press (S21s7) to the right:




< 1

>20 k
S21s7
S21s8
3.0 Outside rearview mirror-vertical adjustment
switch (S21s6)
Function

B5
X35/1




C4

Ignition: OFF
Disconnect left front door separation point (X35/1) connector.
S21s8 set to left mirror.

Press S21s6 forward:

Press s21s6 backward:






- 11 to - 14 V

11 - 14 V
Wiring,
S21s6
S21s8


4.0 Outside rearview mirror-horizontal adjustment
switch (S21s7)
Function

B5
X35/1




B6

Ignition: OFF
Disconnect left front door separation point (X35/1) connector.
S21s8 set to left mirror.

Press S21s7 to the left:

Press S21s7 to the right:






- 11 to - 14 V

11 - 14 V
Wiring,
S21s7
S21s8
5.0 Mirror adjustment motor (up/down) (M21/1m1)
Activation
X35/1
B5
C4




+
Ignition: OFF
Disconnect left front door separation point (X35/1) connector.


Use bridges with
124 589 37 63 00 safety cable only.
Motor runs. Wiring,
M21/1m1
6.0 Mirror adjustment motor
(in/out) (M21/1m2)
Activation
X35/1
B5
B6








+
Ignition: OFF
Disconnect left front door separation point (X35/1) connector.


Use bridges with
124 589 37 63 00 safety cable only.
Motor runs. Wiring,
M21/1m2
7.0 Outside rearview mirror-vertical adjustment
switch (S21s6)
Function

B5

X35/1

B6
Ignition: OFF
Disconnect right front door separation point (X35/2) connector.
Set S21s8 to right mirror.

Press S21s6 forward:

Press S21s6 backward:






- 11 to - 14 V

11 - 14 V
Wiring,
S21s6
S21s8
8.0 Outside rearview mirror-horizontal adjustment
switch (S21s7)
Function

B5

X35/2

C4
Ignition: OFF
Disconnect right front door separation point (X35/2) connector.
Set S21s8 to right mirror.

Press S21s7 to left:

Press S21s6 to right:






- 11 to - 14 V

11 - 14 V
Wiring,
S21s7
S21s8
9.0 Right mirror adjustment motor (up/down) (M21/2m1)
Activation
X35/2
B5
B6






+
Ignition: OFF
Disconnect right front door separation point (X35/2) connector.


Use bridges with
124 589 37 63 00 safety cable only.
Motor runs. Wiring,
M21/2m1
10.0 Right mirror adjustment motor (in/out) (M21/2m2)
Activation
X35/2
B5
C4






+
Ignition: OFF
Disconnect right front door separation point (X35/2) connector.


Use bridges with
124 589 37 63 00 safety cable only.
Motor runs. Wiring,
M21/2m2
11.0 Left mirror heater (M21/1r1)
Voltage supply

C5
X35/1

C6
Ignition: ON
Disconnect left front door separation point (X35/1) connector.
11 - 14 V Wiring,
1.0
11.1 Left mirror heater (M21/1r1)
Resistance

C5

X35/1

C6
Ignition: OFF
At outside temperatures
>15° C (59° F): spray mirror glass with "electronic freeze mist" (aerosal can) to cool glass down, wait 1 minute, measure resistance.
<10 M21/1r1
12.0 Right mirror
heater (M21/2r1)
Voltage supply

C5
X35/2

C6
Ignition: ON
Disconnect right front door separation point (X35/2) connector.
11 - 14 V Wiring,
1.0
12.1 Right mirror heater (M21/2r1)
Resistance

C5

X35/2

C6
Ignition: OFF
At outside temperatures
>15° C (59° F): spray mirror glass with "electronic freeze mist" (aerosal can) to cool glass down, wait 1 minute, measure resistance.
<10 M21/2r1