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Re: cruise control diagram for 2005 9-5 ?
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Posted by Tom G [Email] (#1951) [Profile/Gallery] (more from Tom G) on Tue, 11 Oct 2016 07:48:47 Share Post by Email
In Reply to: cruise control diagram for 2005 9-5 ?, Bruce A, Tue, 11 Oct 2016 06:54:01
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Still look for a diagram. In the mean time, here's a description of some of the functions.
BTW, do you have any trouble codes? How about secondary symptoms?

Vehicle speed is sensed by the ESP system through a proximity sensor at each wheel. The sensor supplies the control module with alternating current, the amplitude and frequency of which increase with increasing wheel speed. The frequency is proportional to wheel speed, 29 Hz at a speed of one wheel revolution per second. The ESP control module uses the 4 wheel speeds to prevent wheel lock-up on braking.

The ESP control module is connected to the P-bus and transmits the wheel speed for each of the four wheels. However, only the speed of the rear left and front right wheels are used by other systems.

Wheel speed RL: The ESP control module transmits the bus message "Wheel speed rear left xxx km/h". This message is used by the MIU (internal). The MIU sends "Vehicle speed" along the P-bus and I-bus.

Wheel speed FR: The ESP control module transmits the bus message "Wheel speed front right xxx km/h". This message is used by the engine control module.

Since the main instrument panel is connected to a bus, all control modules connected to the bus are supplied with information on the speed of the left-hand rear wheel and the odometer reading.

The table of transmitted bus messages shows that MIU transmits the vehicle speed and that it is used by: Trionic, SID, ACC, Audio and TWICE. MIU also transmits the odometer reading, which is used by SID for the service indicator.

The various systems use the vehicle speed for the following functions:

•The PSG 16 (diesel) receives information about the wheel speed of all four wheels via the bus and a separate lead from the ESP for front right wheel speed. The wheel speed signal on the separate lead is used by the cruise control function.
•DICE uses the value to activate the radiator fans for A/C on, high outside temperature and low speed.
•SID uses the value for trip computer functions.
•ACC uses the value for activating recirculation in connection with high outside temperature and low speed.
•The Audio system uses the value for increasing the volume at high speeds.
•TWICE uses the value for automatic locking of the doors when driving off (certain markets).

Diagnosis

The ESP has extremely good diagnostics for its wheel sensors. This means that with a high degree of certainty the wheel speed signals will be present on the control module's four outputs if no diagnostic trouble codes have been generated in the system.

Neither the main instrument panel nor any of the other bus systems have speed signal diagnostics for the LH rear wheel. If the speedometer is working, however, it is certain that speed information is present on the bus and consequently available to all systems connected to the bus.

If the speedometer does not work, the speed on a bus is constantly 0, and there are no DTCs in the ESP, it is most likely that the ESP is missing from the bus.

The PSG 16 (diesel) includes diagnostics for the speed signal from the front right wheel.

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