Tachometer

�hlVIndicator Warning Lamps: Tachometer Unit:

WIRING DIAGRAM

Tachometer Unit: Component Location:

COMPONENT LOCATION VIEW

Tachometer Unit: Component ID:

COMPONENT ID

10 Lights switch on the dashboard between the steering wheel and driver's door.
16 Rheostat, lighting for instruments and controls, on dashboard between the steering wheel and driver's door.
23 Flasher relay, on the relay board behind the glove box.

In The Main Instrument Display Panel
18 Lighting, instruments and controls
47h Direction indicator repeater lamp, left-hand
47v Lights-on indicator lamp
47x TCS (anti-spin) indicator lamp
110 Tachometer (rev counter)
159 Distribution terminal (+15 circuit), in main fuse box behind the glove box.
213 Pictogram, in the main instrument display panel.
289 Control module, anti-theft alarm, on the right-hand side under the dashboard behind the knee shield.
382 ABS-TC control module on the battery tray
430 Saab Trionic control module, in engine bay on the left behind the bulkhead partition.
507 TCS control module, V6, under the left- hand front seat.
510 Motronic 2.8.1 control module, in engine bay behind the bulkhead partition.
583 Control module, anti-theft alarm with immobilizer, on the right-hand side under the dashboard behind the knee shield.
587 Motronic M5.2 control module, mounted on a bracket under the dashboard.
589 Saab Trionic OBDII control module, in the engine bay on the left behind the bulkhead partition.

70-Pin Connector
H70-1 In the engine bay, behind the bulkhead partition.

Grounding Points
G8 Grounding point, dashboard, by the left-hand front loudspeaker socket.

DESCRIPTION OF OPERATION
Tachometer (rev counter) 110
Tachometer (rev counter) 110 in main instrument display panel 47 is supplied with current via fuse 13 and pin 1.

The control pulses needed by the tachometer to show engine rpm are obtained from the engine control module via pin 2. The tachometer is connected to ground via pin 6.

Instrument Lighting 18
Background lighting of the instruments is controlled from rheostat 16 (lighting for instruments and controls) via pin 7 and the lamps are connected to ground via pin 6.

Indicator Lamp 47h
The indicator lamp for the left-hand direction indicators is controlled from flasher relay 23 via pin 3 and connected to ground via pin 6.

The lamp can also be activated directly from the anti-theft alarm control module.

Indicator Lamp, Lights On, 47v
Cars for certain markets are equipped with an indicator lamp that shows when the parking lights are on.

With the ignition switch in the Drive position, current is supplied to pin 5 via lights switch 10. The lamp is connected to ground via pin 6.

Indicator Lamp 47x
The lamp is supplied with positive current on pin 1 via fuse 13. When pin 4 of the lamp is connected to ground via control module TCS 507, the lamp will light up.

FAULT DIAGNOSIS HINTS
1. Check that fuse 13 is intact and supplied with current.
2. Check the connectors, wiring harness and ground connections.

The lights-on indicator lamp is activated when lights switch 10 is turned to position 1 or 2.
1. Check that the lights switch is supplied with current.
2. Check that the bulb is OK and that current is supplied to the card for the indicator and warning lamps and also to the tachometer.
3. Check the connectors, wiring harness and ground connections.