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I’ve got the electrical diagram of the instrument cluster and I’m looking to tap two leads to control my Pioneer AVIC-D3 DVD/Radio/CD/Nav/BackupCam. So here is my question on the diagram below: What do the terminals A21 DIM LED, A30 CAN WAKE UP, A31CAN HIGH DISPLAY, A32 DIM LAMP mean?
I'm looking to connect the AVIC wake up lead (to start the device) and another to dim. The only two circuits in the car that will do what I want are in the instrument cluster (LED displays & photosensitive cluster backround). Any and all takers welcome to conjure up a guess??
Can high and Can low are the two CAN networks that run in the car, HIGH transfers information for the important functions like PASM, PSM, etc. Low controls comfort, convenience features and there is some redundancy between the two. The CAN control center actually is in the instrument cluster in the Cayman. I don't think you'll be able to tap those.
That's all I know... the dim leads might be connected to be the light sensor, and are probably typical electric lines.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
__________________
- Suneet
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Can high and Can low are the two CAN networks that run in the car, HIGH transfers information for the important functions like PASM, PSM, etc. Low controls comfort, convenience features and there is some redundancy between the two. The CAN control center actually is in the instrument cluster in the Cayman. I don't think you'll be able to tap those.
That's all I know... the dim leads might be connected to be the light sensor, and are probably typical electric lines.
suneet, I am not sure that the CAN processor is on the cluster. Remember the cluster is only displaying stuff like engine/wheel speed, sensor status like heat, oil, water, fuel and the computer that displays mpg, est. fuel, trip odometer, warning sensors and has no fiber optic connections. The cluster displays are activated by CAN but has no other engine/vehicle management control. Perhaps A30 CAN WAKEUP activates the LEDs when you open the door? If so then, this leads me to wonder if either A20 DIM LAMP and A21 DIM LED illuminate the gauges in low light condition? -Stevie
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
You're right... as of MY05 the Gateway unit is separate from the instrument cluster.
Anyways, the CAN bus incorporate several control units and has a series of digital and analog inputs and outputs. I know for sure that inside lights, light swiches, the dash illumination potentiator are all analog signals on the Cayenne... as I've seen the CAN diagrams for the Cayenne; they're in the file that I link to later. I would image those are the same for the Cayman.
However, the CAN display high and can display low, I'm pretty certain, are the digital leads that transfer the data to the gauge display (audio, nav, trip computer, etc.). You see the same cables on the CAN plug on the back of the headunit... as it's a part of the network.
This file shows in theory how the CAN bus works, page 1.10 shows the network map on the 987/997. It shows the CAN display network has its own gateway controller, and connects to the instrument cluster, PCM2.1 and the sport chrono. Can Drive on the map is the "high" priority network, the CAN Comfort is the "low" priority networks; that's explained in the subsequent pages.
Sport Chrono and Chrono Plus
This optional package is a valuable addition for trackday use. Available in conjunction with the CDR-24 CD radio, it includes a swivel-mounted analog and digital timer unit which is centrally located on the dashboard. All functions are easily accessible via the control stalk for the on-board computer. Analog dials measure hours, minutes and seconds, while a separate digital field displays whole seconds, tenths and one hundredths of a second. A second digital display runs in parallel in the instrument cluster. Click this Link to visit the FAQ entry for Sport Chrono.
__________________
- Suneet
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Thanks for the good information, Suneet. It was helpful in understanding the diff between CAN and MOST and, I learned that CAN signals travel over copper (and MOST over fiber). This means the CAN leads will not provide sufficient nor consistent voltage to satisfy the AVIC control switch. This leaves only two leads that I suspect may achieve my objectives; A20 DIM LAMP and A21 DIM LED.
Now, looking closer at the circuit in the diagram that connects to A21 DIM LED, they all go to other LED lights (air vents, central button module, etc.). Do you know off hand if they automatically dim in low light condition? If yes, then I’ve got my dim control. I can't check until I get the Cayman back in the garage tonight. -Stevie
Linear Mode
