9-5 Sport Wagon (9600) L4-2.3L Turbo (B235) (2003)
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If no current from the +30 circuit is present, the display will not be active and diagnostic communication will not be possible.
If no current from the +15 circuit is present, the display will not be active but can be turned on via the bus by switching on the radio, for example.
Diagnostic communication will be possible with limited functions if the ignition key is turned to ON.
The SID will not generate a diagnostic trouble code if no current is present from either the +30 or +15 circuits.
Coolant Level Sensor
Coolant Level Sensor
General
The coolant level sensor consists of a round magnetic float which moves up and down along a hollow column attached to the bottom of the expansion
tank. The sensor sits in the hollow column on the outside of the tank and is affected by the magnet.
The SID sends B+ to the level sensor via pin 18, and the sensor is grounded at grounding point G40. At normal level, the float arm is level with the
switch, the magnet in the float arm closes the circuit and pin 18 of the SID is grounded. At low levels, the circuit to ground is broken.
The function generates a CHECK message in the SID (30 seconds delay).
Diagnostics
If the circuit to the coolant level sensor is broken, the text message "FILL COOLANT FLUID" will be shown despite a correct coolant level.
If a short-circuit to ground occurs, the CHECK message will not be shown even if the coolant level is low.
The SID will not generate a diagnostic trouble code.
Display Lighting Level
Display Lighting Level
