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Test readings, control module connections

Test readings, control module connections

Scope



The following pages include values and directions for measuring signals and levels on the main instrument unit and its control module.

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.

Finally check the control module outputs. Remember that the test readings do not indicate whether the actuator is working.

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+.


Control module connections


Pin

Pin BOB

Lead colour

Component/Function

In/Out

Test conditions



Across

Test reading

See

1

1

RD

Battery Voltage (+30 circuit)

In

Ignition ON



1-B+

< 0.5 V



2

2

RD/BU

Battery Voltage (+15 circuit)

In

Ignition ON



2-B+

< 0.5 V



3

3

VT

Wheel speed, Rear left

In

Ignition ON

Rotate wheel slowly

3-18

0 V B+

(LP HI LOp)



Rotate wheel 1/2 revolution per second

3-18

15 Hz 50%

(LP HI LOp)



4

4

YE/WH

Sensor, fuel level

In

Ignition ON



10-4

0.5-3.7 V



5

5



No connection













6

6

GN/WH

Warning lamp, charging

In

Ignition ON

On

6-B-

0 V



Off

6-B-

B+



7

7

OG

ABS warning lamp

In

Ignition ON

On

7-B-

0 V



Off

7-B-

B+



8

8

GN

I Bus (+)

In/Out

Ignition ON



8-18

2.5 V



9

9

WH

P-bus (-)

In/Out

Ignition ON



9-18

2.5 V



10

10

GY/WH

Ground, Sensor ground, fuel level sensor

Out

Ignition ON



4-B-

< 0.1 V



11

11

WH

Main beam indicator lamp

In

Ignition ON

On

11-B-

B+



Off

11-B-

0 V



12

12

RD/GN

Lights-on indicator lamp

In

Ignition ON

On

12-B-

B+



Off

12-B-

0 V



13

13

BU

Warning lamp, brake fluid level

In

Ignition ON

On

13-B-

0 V



Off

13-B-

B+



14

14

GN

Warning lamp, handbrake

In

Ignition ON

On

14-B-

0 V



Off

14-B-

B+



15

15

BU

Engine oil pressure warning lamp

In

Ignition ON

On

15-B-

0 V



Off

15-B-

B+



16

16

WH

I Bus (-)

In/Out

Ignition ON



16-18

2.5 V



17

17

GN

P-bus (+)

In/Out

Ignition ON



17-18

2.5 V



18

18

BK

Ground

In

Ignition ON



18-B-

<0.5 V



19

19



No connection













20

20



No connection













21

21



No connection













22

22

GN

Xenon lamp system indicator

In

Ignition ON

On

22-B-

0 V



Off

22-B-

B+





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