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Test readings, control module connections

Test readings, control module connections


Scope

This section contains the readings and instructions for measuring voltage levels on the SID unit.

Remember:


Note the test conditions and use common sense when assessing the test result.

First check that the control module has a power supply and is grounded.

Then check all sensor inputs and signals from other systems.

Lastly, check the control module outputs. Remember, the readings do not say anything about whether or not the actuator is in working order.

If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.

The specified test readings refer to those obtained with a calibrated Fluke 88/97.

The test readings show the signal's pulse ratio and pulse width. A test instrument with pulse ratio and pulse width measurement must be used. The sign indicates a positive trigger pulse, TRIG+.



Control module connection

Pin no.

Component/

Function

In/Out

Test conditions

Across

Test reading

See

1

I-bus (1-lead)

In/Out

Ignition ON

1-32

0-5 V

2

I-bus (1-lead)

In/Out

Ignition ON

2-32

0-5 V

3

No connection











4

Parking heater, indication

Out

Ignition ON

4-32



Not activated

∼B+

Activated

<0.5 V

5

No connection











6

No connection











7

No connection











8

No connection











9

No connection











10

No connection











11

No connection











12

No connection











13

Battery voltage +30

In



13-32

B+



14

No connection











15

No connection











16

TCM, downshifting/upshifting

Out

Ignition ON













Hold Gear

16-B-

0.5-1.4V









Shift Gear Up (+)

16-B-

1.4-1.79V









Shift Gear Down (-)

16-B-

2.7-3.5V



17

I-Bus (2-lead) (-)

In/Out

Ignition ON

17-32

2.5 V



18

I-Bus (2-lead)

In/Out

Ignition ON

18-32

2.5 V



19

Horn relay

Out

Ignition ON

Horn NOT activated.

19-32

B+









Horn activated.

19-32

0 V



20

Parking heater / auxiliary heater

Out

Activated

20-32

0 V









Not activated

20-32

B+



21

Ambient temperature sensor

In

Ignition ON

Temperature readings:













10°C/50°F

21-32

∼2.49 V









20°C/68°F

21-32

∼1.72 V









30°C/86°F

21-32

∼1.43 V



22

Outside temperature sensor, ground

-

Ignition ON

22-32

<0.1 V



23

Rheostat

In

Ignition ON

“Max” rheostat position.



23-32



0 V









“Min” rheostat position

23-32

3.5 V



24

Rheostat, ground

-

Ignition ON

24-32

<0.1 V



25

Steering wheel control (switches)

In

Ignition ON

Press the following buttons:



-









Horn

25-32

0 V









Shift Gear Up (+)

25-32

0.7 V









Shift Gear Down (-)

25-32

0.8 V









VOL -

25-32

1.3 V









VOL +

25-32

1.7 V









SRC

25-32

2.1 V









SEEK >>

25-32

2.5 V









<< SEEK

25-32

2.9 V









NXT

25-32

3.3 V









Normal position

25-32

4.0 V



26

Steering wheel control, ground

-

Ignition ON

26-32

<0.1 V



27

Filament monitor, front lamps

In

Ignition ON

OFF



27-32



B+









ON

27-32

0 V



28

Coolant level sensor

In

Coolant present (closed contact).

28-32

0 V









No coolant present (open contact).

28-32

B+



29

Washer fluid level sensor

In

Washer fluid present (open switch).

29-32

B+









No washer fluid present (closed switch)

29-32

0 V



30

Battery voltage +15

In

Ignition ON

15-32

B+



31

Night panel, switch

In

Ignition ON

31-32

<0.5 V

32

Ground

Out

Ignition ON

32-B-

<0.5 V