Hey Guys,

My 99 keeps popping up a code under A6-SCM (seat control module). The code is B2606. I looked it up and it is for Seat Rear Vertical Position Sensor Failure :confused: . It always pops up as an H code, which means it's an intermitent problem. I'm really not willing to take it to the dealer to be fixed (if that's even within a dealer's power :rolleyes: :lol: ), especially since there's been no noticeable problem with the seat. I was just wondering if there's something that I could do myself to stop this becoming a problem in the future.

Thanks for any input. :cheers:

Jim

 

SleepieAce,
The long story is below, but I would check all the connections under the seat.

later,

The memory seat functions, are operated when voltages from the LH seat switch are first applied to the LH Seat Control Module (SCM). The SCM then stores the voltage appearing at the rear vertical position sensor signal wire when either memory push button is pressed.

The SCM provides a steady 5 volt supply (CKT 1985) and a ground (CKT 782) to the rear vertical position sensor. The rear vertical position sensor, which is a variable resistor, provides a return voltage on the signal wire (CKT 568) to the SCM. Depending upon the location of the seat motor, the voltage in the signal wire varies from .1 to 4.78 volts. When one of the memory buttons is pressed, the SCM applies voltage to the motor until the position sensor voltage equals the stored value. The seat will then have returned to the stored vertical position.

Conditions for Setting the DTC
The rear vertical position sensor input, to the SCM, is under the voltage range of .1 V or over 4.78 V for 2 seconds or more.

Action Taken When the DTC Sets
Stores a history DTC B2606 in the SCM memory.
This DTC can only be set as a history code even if the malfunction is current.
No driver warning message will be displayed for this DTC.
The memory operation/function of the faulted position sensor is disabled.
Conditions for Clearing the DTC
The rear vertical position sensor input, to the SCM, is within the voltage range of .1 V - 4.78 V for 2 seconds or more.
Using the DTC clearing feature in the IPC.
Using a scan tool.
Diagnostic Aids
If the DTC does not reset after the code is cleared, then the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
The following conditions may also cause an intermittent malfunction:
There is an intermittent open, short to ground or battery in CKTs 568 or 1985.
There is an intermittent open or short to battery in CKT 782.
The rear vertical position sensor is open or shorted internally.
If the SCM is unable to determine the correct vertical position, manual power seat functions will still operate, but the SCM will not be able to recall the correct seat memory settings.
Using a scan tool, select SCM data display and monitor the rear vertical position data. Move the power seat vertically in both directions while monitoring the position sensor data. The voltage range should vary and stay between .1-4.78 volts depending on the position of the seat. This checks if the seat rear vertical position sensor is open or shorted in different positions.

 

:eek: :eek: Wow...lots of good info!! :thumbs:

Thanks Thrap...I'll check it out. :cheers: