Test readings, control module connections: Remember

Note the test conditions and use common sense when assessing the test result.
The presented readings are with the ignition ON unless otherwise stated.
First check that the control module has a power supply and is grounded.
Then check all sensor inputs and signals from other systems.
Finally, check the control module outputs. Remember that the test readings do not indicate 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 values % (+) and ms (+) indicate the pulse ratio and pulse duration of the signal. A test instrument for measuring pulse ratio and pulse duration must be used. The (+) sign indicates a positive trigger pulse, TRIG+.

Fig 1: Checking Control Module Outputs

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Control Module Connector Pinouts

Courtesy of SAAB-SCANIA OF AMERICA, INC.

CONTROL MODULE CONNECTOR PINOUTS REFERENCE TABLE

Pin No.	Cable color	Component/function	In/Out	Test conditions	Across	Test reading	See
1	BK	Ground	Out	Ignition ON	1-B-	<0.5 V	SID UNIT GROUND
2		No connection
3	YE/WH	Steering wheel controls, ground	-	Ignition ON	3-B-	<0.1 V	STEERING WHEEL CONTROLS
4	BK/WH	Rheostat, ground	-	Ignition ON	4-B-	<0.1 V	RHEOSTAT
5	GN/BU	Outdoor temperature sensor ground	-	Ignition ON	5-B-	<0.1 V	TEMPERATURE SENSOR, OUTDOOR
6		No connection		Temperature sensor, outdoor
7		No connection
8	YE/GY	Battery Voltage +15	In	Ignition ON	8-B+	<0.5 V	SID UNIT POWER SUPPLY
9	WH	Bus (-)	In/Out	Ignition ON	9-1	2.5 V	BUS MESSAGES
10	BN	Filament monitor, front lights	In	Ignition ON	10-1	B+	FILAMENT MONITOR, FRONT LIGHTS
11	RD/YE	Rheostat +	In	Ignition ON "Max." rheostat position.	11-1	0 V	RHEOSTAT
				"Min." rheostat position	11-1	3.5 V
12		No connection
13		No connection
14		No connection
15	RD/WH	Battery Voltage +30	In	Ignition ON	5-B+	<0.5 V	SID UNIT POWER SUPPLY
16	GN	Bus +	In/Out	Ignition ON	16-1	2.5 V	BUS MESSAGES
17	YE/WH	Horn, relay	Out	Ignition ON Horn NOT activated.	17-1	B+	HORN
18	BK/YE	Steering wheel controls + (switches)	In	Ignition ON Press the following buttons:		-	STEERING WHEEL CONTROLS
				Horn	18-1	0 V
				VOL -	18-1	0.7 V
				VOL +	18-1	1.2 V
				SRC	18 -1	1.8 V
				SEEK	18 -1	2.4 V
				<< SEEK	18 -1	3.0 V
				NXT	18 -1	3.6 V
				Normal position	18 -1	4.2 V
				ON	18 -1	0 V
19	YE/GN	Temperature sensor, outdoor	In	Ignition ON Temperature readings:			TEMPERATURE SENSOR, OUTDOOR
				10 °C/50°F	19 -1	2.49 V
				20 °C/68°F	19 -1	1.72 V
				30 °C/86°F	19 -1	1.43 V
20	RD/BU	Parking heater / auxiliary heater	Out	Activated	20 -1	0 V
				Not activated	20 -1	B+
21	GY/WH	Washer fluid, level sensor	In	Washer fluid present (closed contact).	21 -1	0 V	WASHER FLUID LEVEL SENSOR
				No washer fluid present (open contact).	21 -1	B+
22	BK/GN	Coolant, level sensor	In	Coolant present (closed contact).	22 -1	0 V	ENGINE COOLANT LEVEL SENSOR
				No coolant present (open contact).	22 -1	B+

> = greater than; < = less than; ~ = alternating current (LP: LOGIC PROBE P = select pulse; p = visible pulse)