Control Module Inputs, Outputs, Bus, Power Supply and Ground
Control Module Inputs
- Speed signal from ABS (547)
- ABS warning light (ANTILOCK) from ABS (547)
- Xenon lamp system indicator from AHL control module (664 FL/FR)
- Warning lamp, charging (2)
- Lights-on indicator lamp from lights switch (10)
- Main beam indicator lamp from main headlamp relay (8a)
- Battery Voltage (+30) (1)
- Battery Voltage (+15) (20)
- Ground connection (G41S)
- Oil pressure warning lamp from oil pressure sensor (44)
- Brake fluid level warning lamp from brake fluid reservoir (42)
- Warning lamp, handbrake (43)
- Fuel level from fuel level sensor (46)
- Low fuel level indicator lamp (46)
Control Module Inputs, Bus
Cars with petrol engine
Cars with V6 diesel engine
Cars with 4-cyl diesel engine
- Engine speed information from ECM
- Coolant temperature information from ECM
- Fuel Consumed Since Start from ECM
- Turbo boost gauge from Trionic
- CHECK ENGINE indicator lamp from ECM
- CRUISE indicator lamp from ECM
- SHIFT UP indicator lamp from Trionic
- CHECK GEARBOX indicator lamp from TCM (502)
- SPORT indicator lamp from TCM (502)
- WINTER indicator lamp from TCM (502)
- Selector lever indicator from TCM (502)
- ABS warning lamp from TC/ABS (382)
- TCS/ESP OFF indicator lamp from TC/ABS (382) or ESP (671)
- TCS/ESP indicator lamp from TC/ABS (382) or ESP (671)
- AIRBAG warning lamp from SRS (331)
- Rheostat level from SID (541)
- Rheostat Night Panel from SID (541)
- NIGHT PANEL from SID (541)
- Display lighting value from SID (541)
- Cabin light intensity value from SID (541)
- INFO DISPL indicator lamp from SID (541)
- Steering wheel location from TWICE (632)
- "Door open" indicator lamp from TWICE (632)
- LH direction indicator lamp from DICE (628)
- RH direction indicator lamp from DICE (628)
- Rear fog light indicator lamp from DICE (628)
- Glow indicator lamp from ECM (diesel)
Control Module Outputs, Bus
Cars with petrol engine
Cars with V6 diesel engine
Cars with 4-cyl diesel engine
- Vehicle speed
- Odometer reading used by SID (541)
- Fuel level used by SID (541), ECM
- Acoustic signal central warning lamp used by SID (541)
- Diagnostic communication (445)
- Identification number used by TWICE (632)
Control Module
The main instrument display is a complete unit with only the front glass replaceable separately.
The main instrument unit has a 22-pin connector.
The control module receives information from its own sensors and contacts and from other systems. The control module processes and uses the information to control the instrument and LEDs. Certain data is sent out on the buses.
On faults the control module stores the trouble codes. When replaced, the new control module must be programmed for parts and immobiliser. The distance travelled by the car, which is stored in the old control module and shown on the display, must be programmed into the new control module.
The instrument unit contains gauges which are controlled by the control module itself with information from other systems and its own sensors. Warning and indicator lamps are controlled by both the own sensors/contacts and other system control modules. All warning, indicator and illumination lamps are LEDs and are not replaceable.
The odometer and tripmeter display is a unit with two digital counters, a six-digit counter for the odometer and a four-digit counter for the tripmeter.
The control module stores the distance travelled and shows this on the display.
Diagnostics
If an internal fault occurs in the main instrument unit's control module, diagnostic trouble code B1605 is set.
Power Supply
Battery Voltage (+30 circuit)
The +30 circuit is supplied via fuse 17 to the main instrument unit pin 1.
The control module uses current from the +30 circuit for its memory.
Battery voltage (+15 circuit)
The +15 circuit is supplied via fuse 27 to the main instrument unit pin 2.
The main instrument unit is activated by current from the +15 circuit.
Diagnostics
If there is no current supply from the +30 circuit, the tripmeter will be zeroed every time the ignition is switched off.
If no +15 current is present, the main instrument unit will not be "woken up". The engine will not start as bus communication has not been "awakened".
The function has no diagnostics.
Ground
The main instrument unit is grounded through pin 18 to ground point G41S.
Diagnostics
If there is no ground, only the indicator lamp for the xenon lighting system will function as this is grounded outside the main instrument. Other functions will not work.
The function has no diagnostics.