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Volume 1
Climate Control
Diagnostic Manual, Info./Comm., Volume 1

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LOCATION:    1.14 Instrument Cluster (IC)    >   26 Electrical Test Program - Test


Electrical Test Program - Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy
1.0 Instrument cluster (A1)
Voltage supply
Terminal 30

3
(1A.3)

12
(1A.12)
A1




11
(1A.11)

11
(1A.11)
Ignition: OFF
Remove Instrument cluster (A1)
Disconnect connector 1
(30-pin) 		11 - 14 V Fuse 34 in fuse and relay box (F1),
Wiring,
1.1
1.1 Voltage supply
Terminal 15
3
(1A.3)
A1

9
(1A.9)
Ignition: ON 11 - 14 V Fuse 37 in fuse and relay box (F1),
Wiring,
A1
2.0 HHT interface
Connection between A1 and data link connector (X11/4) 		X11/4
15

A1
11
(1B.11)
Ignition: OFF
Remove A1,
Disconnect connector 1
(30-pin)
5

Wiring.
3.0 ECL and windshield washer level:
ECL level switch (S41), windshield washer level switch (S42) and wiring
12
(1B.12)
A1

4
(1B.4)
Ignition: OFF
Coolant level and windshield washer fluid level: OK
Remove A1
Disconnect connector 1 (30 pin). 		233 - 297

Wiring
3.1
Values O.K.:
A1
3.1 ECL switch (S41)
Resistance
1
S41

2
Ignition: OFF
Remove expansion tank
Disconnect connector at S41
Coolant level OK
102 - 120

S41
Values O.K.:
3.2
3.2 Windshield washer fluid level switch (S42)
Resistance
1
S42

2
Ignition: OFF
Disconnect connector at S42
Washer fluid level OK 		145 - 185


S42
4.0 CAN bus data lines
Resistance
9
(1B.9)
A1

10
(1B.10)
Ignition: OFF
Disconnect connector 1
(All control modules are connected to CAN)

around 60 		CAN: ,
N47
N3
Values O.K.:
4.1
4.1 CAN bus data lines
Voltage Low-data line

A1
2
(2B.1)
Ignition: ON

around 2.3 V 		N47
N3
Values O.K.:
4.2
4.2 CAN bus data lines
Voltage High-data line

A1
2
(2B.20)
Ignition: ON

around 2.6 V 		N47
N3



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