Posted 19 October 2020 - 10:35 AM
Hi, I am NOT certain what causes the reverse lights to work but there is no reverse light switch anywhere.
I am of the opinion they are controlled via the position of a cogged wheel in the centre console and when the lever is in the R position signals are sentr to the TCM (trans control module) which I presume transmits the signal via canbus etc.
Here are some quotes from the Getrag Company Powershift Information Manual describing what is happening in the centre console
A toothed disk integral to the detent plate engages with a toothed wheel that rotates a magnetic wheel. This magnetic wheel excites hall effect sensors in the Transmission Range sensor to provide the P/R/N/D position signal to the TCM.
The gear selector assembly positioned in the center console is mechanically connected to the transmission by
a cable which is used ONLY to engage and disengage the Park gear.
It does NOT move a manual valve in the valve body for there is not a manual valve to move.
The shaft inside the transmission which the gear selector lever rotates to engage and disengage park has a detent plate with a toothed disk that rotates a range sensor integral to the TCM. This provides a direct P/R/N/D signal into the TCM.
The transmission range sensor (TRS) is directly connected to the TCM providing the signal it needs to know if the selector lever is placed into Park, Reverse, Neutral or Drive. This sensor contains a wheel with magnets strategically located around approximately half the wheel to excite hall effect sensors with which its position can be determined.
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