Test readings, control module connections
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Test readings, control module connections
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This section contains the readings and instructions for measuring voltage levels on the SID unit.
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Note the test conditions and use common sense when assessing the test result.
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First check that the control module has a power supply and is grounded.
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Then check all sensor inputs and signals from other systems.
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Lastly, check the control module outputs. Remember, the readings do not say anything about whether or not the actuator is in working order.
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If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.
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The specified test readings refer to those obtained with a calibrated Fluke 88/97.
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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+.
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Control module connection
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Pin no.
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Component/
Function
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In/Out
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Test conditions
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Across
|
Test reading
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See
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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
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|
3
|
No connection
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|
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4
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Parking heater, indication
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Out
|
Ignition ON
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4-32
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|
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Not activated
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∼B+
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Activated
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<0.5 V
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5
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No connection
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6
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No connection
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7
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No connection
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8
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No connection
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9
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No connection
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10
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No connection
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11
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No connection
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12
|
No connection
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13
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Battery voltage +30
|
In
|
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13-32
|
B+
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14
|
No connection
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15
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No connection
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16
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TCM, downshifting/upshifting
|
Out
|
Ignition ON
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Hold Gear
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16-B-
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0.5-1.4V
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Shift Gear Up (+)
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16-B-
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1.4-1.79V
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Shift Gear Down (-)
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16-B-
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2.7-3.5V
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17
|
I-Bus (2-lead) (-)
|
In/Out
|
Ignition ON
|
17-32
|
2.5 V
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18
|
I-Bus (2-lead)
|
In/Out
|
Ignition ON
|
18-32
|
2.5 V
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19
|
Horn relay
|
Out
|
Ignition ON
Horn NOT activated.
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19-32
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B+
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Horn activated.
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19-32
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0 V
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20
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Parking heater / auxiliary heater
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Out
|
Activated
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20-32
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0 V
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Not activated
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20-32
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B+
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21
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Ambient temperature sensor
|
In
|
Ignition ON
Temperature readings:
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|
|
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10°C/50°F
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21-32
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∼2.49 V
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20°C/68°F
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21-32
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∼1.72 V
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30°C/86°F
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21-32
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∼1.43 V
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22
|
Outside temperature sensor, ground
|
-
|
Ignition ON
|
22-32
|
<0.1 V
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|
23
|
Rheostat
|
In
|
Ignition ON
“Max” rheostat position.
|
23-32
|
0 V
|
|
|
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“Min” rheostat position
|
23-32
|
3.5 V
|
|
24
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Rheostat, ground
|
-
|
Ignition ON
|
24-32
|
<0.1 V
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|
25
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Steering wheel control (switches)
|
In
|
Ignition ON
Press the following buttons:
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-
|
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Horn
|
25-32
|
0 V
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|
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Shift Gear Up (+)
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25-32
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0.7 V
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Shift Gear Down (-)
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25-32
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0.8 V
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VOL -
|
25-32
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1.3 V
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VOL +
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25-32
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1.7 V
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SRC
|
25-32
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2.1 V
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SEEK >>
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25-32
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2.5 V
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<< SEEK
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25-32
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2.9 V
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NXT
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25-32
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3.3 V
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Normal position
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25-32
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4.0 V
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26
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Steering wheel control, ground
|
-
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Ignition ON
|
26-32
|
<0.1 V
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27
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Filament monitor, front lamps
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In
|
Ignition ON
OFF
|
27-32
|
B+
|
|
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ON
|
27-32
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0 V
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28
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Coolant level sensor
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In
|
Coolant present (closed contact).
|
28-32
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0 V
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No coolant present (open contact).
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28-32
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B+
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29
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Washer fluid level sensor
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In
|
Washer fluid present (open switch).
|
29-32
|
B+
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|
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No washer fluid present (closed switch)
|
29-32
|
0 V
|
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30
|
Battery voltage +15
|
In
|
Ignition ON
|
15-32
|
B+
|
|
31
|
Night panel, switch
|
In
|
Ignition ON
|
31-32
|
<0.5 V
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32
|
Ground
|
Out
|
Ignition ON
|
32-B-
|
<0.5 V
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