Control Module Inputs, Outputs, Bus, Power Supply and Ground

Control Module Inputs

Control Module Inputs:

- Battery voltage (+30 circuit) (1)
- Battery voltage (+15 circuit) (20)
- Ground connection (G33S)
- Engine oil pressure warning lamp from the oil pressure sensor (44)
- Brake fluid level warning lamp from the brake fluid level sensor (42)







- Handbrake warning lamp (43)
- Fuel level from the fuel level sensor (46)
- Low fuel level indicator lamp (46)
- Coolant temperature information from the coolant temperature sensor (45)
- Diagnostics communication with the engine management system (445)
- Immobilization function







- Vehicle speed signal from the ABS control module (547)
- ABS warning lamp (ANTI LOCK) from the ABS control module (547)
- AIRBAG warning lamp from the airbag control module (331)
- Central warning lamp (Airbag 2) (331)
- Charging warning lamp, generator (2)
- Lights-on indicator lamp from the lights switch (10)
- Main beam indicator lamp from the main beam relay (8a)







- Check Filler Cap text message (to SID) from Trionic (430/589)
- Turbo pressure information from Trionic (430/589)
- A/C relay
- Engine speed from the engine management system (430)
- Fuel consumption information from the engine management system (430/589)
- CHECK ENGINE indicator lamp from engine management system (430/589)
- SHIFT UP indicator lamp from engine management system (430/589)







- Selector lever position indicator from selector lever position sensor (245)
- CHECK GEARBOX indicator lamp from the transmission control module (502)
- SPORT indicator lamp from the transmission control module (502) - WINTER indicator lamp from the transmission control module (502)
- CRUISE indicator lamp from the cruise control system's control module


Control Module Outputs

Control Module Outputs:

- AC out to engine management system (430a/589a)
- Low fuel lever OBDII to engine management system (589)
- Idle speed compensation to engine management system (430a/589a)
- Diagnostics communication with engine management system (445) and immobilization function

Control Module Inputs, Bus

Control Module Inputs, Bus:

- Rheostat value from SID (541)
- Display lighting value from SID (541)
- Night Panel rheostat value from SID (541)
- Light intensity in cabin from SID (541)
- INFO DISPL indicator lamp from SID (541)
- NIGHT PANEL from SD (541)
- "Door open" indicator lamp from TWICE (632)
- Indicator lamp for LH direction indicators from DICE (628)
- Indicator lamp for RH direction indicators from DICE (628)
- Rear fog light indicator lamp from DICE (628)
- A/C relay from DICE
- Current consumption from DICE (628)
- Steering wheel location from TWICE (632).
- Diagnostics communication (445)

Control Module Outputs, Bus

Control Module Outputs, Bus:

- Vehicle speed information
- Odometer reading (to SID unit) (541)
- Fuel level (to SID unit) (541)
- Fuel consumption (to SID unit) (541)
- Acoustic signal, central warning lamp (request to SID unit) (541)
- A/C relay confirmation to DICE
- Engine has started to the SID unit (541).
- Coolant temperature to DICE (628), ACC (216) and the SID unit (541)
- Engine speed
- TIGHTEN FUEL FILLER CAP text message (from Trionic) to the SID unit (541)
- Diagnostics communication (445)
- Identification number to TWICE (632)

Control Module







The main instrument unit consists of three replaceable main components:
- Instrument unit
- Control module (electronic unit MIU)
- Odometer display

The control module is integrated into the main instrument unit and has two or three connectors, a 12-pin connector (K12), a 20-pin connector (K20) and a 22-pin connector (k22).

The design of the main instrument unit differs according to the engine variant mounted in the car. Since petrol-engined cars do not have a P bus, they are fitted with a 22-pin connector (K22) in addition to the two other connectors. Cars with a diesel engine have a P-bus and do not therefore need this 22-pin connector.

The control module receives information from its own sensors and switches as well as from other systems. It processes the information and uses it to control instruments and lamps. Certain information is sent out on the I bus.

When a fault occurs, the control module stores the diagnostic trouble code. In case of replacement, a control module for that specific car must be ordered and its programming will then be carried out at Saab Automobile. The odometer reading stored in the old control module and shown on the display must be programmed into the new control module.

The instrument unit contains gauges and meters controlled by its own control module on the basis of information received from other systems as well as its own sensors. Warning and indicator lamps which are controlled by their own sensors/switches as well as control modules from other systems. All the warning lamps, indicator lamps and light bulbs (not LEDs) are replaceable.

The odometer and trip meter display is a unit with two digital counters, a six-digit counter for the odometer and a four-digit counter for the trip meter.

The control module stores the distance driven and displays it. There is a lamp in the display which is replaceable.

Diagnostics
If an internal fault occurs in the main instrument unit's control module, diagnostic trouble code B1605 is set.

Power Supply

Power Supply:

Battery Voltage (+30 Circuit)
Current (+30 circuit) is supplied via fuse 35 (22a) to main instrument unit pin 7 (K12). The control module uses current from the +30 circuit for its memory.

Battery Voltage (+15 circuit)
Current (+15 circuit) is supplied via fuse 17 (22a) to main instrument unit pin 1 (K12) and pin 6 (K12).
The main instrument unit is activated by current from the +15 circuit.

Diagnostics
If there is no current supply from the +30 circuit, the trip meter will be zeroized every time the ignition is switched off.

If no +15 current is present, the main instrument unit will not be activated. The engine will not start as bus communication has not been activated.

The function has no diagnostics.

Ground

Ground:

The main instrument unit is grounded through pin 2 (K12) and pin 3 (K12) to grounding point G33S. The grounding points are internally connected.

Diagnostics
If there is no ground connection, warning lamps, etc. which are grounded outside the main instrument unit (such as the ABS warning lamp) will still work.

If there is no ground connection the main instrument unit will not be activated. The engine will not start if bus communication is inoperative.