Checking the operation of pushbuttons and manual controls
Symptom: Seat cannot be operated in certain positions. No diagnostic trouble code. One of the "Read switches" in the ISAT shows "Open".
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Checking the operation of pushbuttons and manual controls
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Fault symptom:
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Seat cannot be operated.
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No diagnostic trouble code.
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All "Read switches" in the ISAT show "open".
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Diagnostic procedure:
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1.
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Check that the control module is supplied with power,
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2.
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Unplug the control module's 16-pole connector and plug in a BOB.
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3.
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Check that a supply of about 12 V is present across pin 8 and chassis ground. If it is not
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4.
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Measure the voltage across pins 8 and 9. It should be about 12 V. If it is not, check the ground cable (pin 9) for continuity/shorting.
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Fault symptom:
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Seat cannot be operated in certain positions.
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No diagnostic trouble code.
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One of the "Read switches" in the ISAT shows "Open".
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Diagnostic procedure:
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1.
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Unplug the control module's 16-pole connector and plug in a BOB.
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2.
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Connect the BOB between pin 8 and the following pins, depending on the fault:
Pin 7 - memory button 1 Pin 6 - memory button 2 Pin 5 - memory button 3 Pin 16 - memory button M
If entire functions are inoperative, check the wiring between pin 8 of the control module and pin 1 of the pushbutton assembly.
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3.
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Connect a jumper lead between pin 8 and
pin 1 - backrest upright 2 - backrest recline 3 - front down 4 - front up 10 - rear down 11 - rear up 12 - seat forwards 13 - seat rearwards
If the seat moves as desired, change the pushbutton assembly or the switch assembly.
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4.
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If the seat does not move, check the wiring between the switch and the control module for continuity/shorting.
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5.
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Turn to page 852-55, "Before control module replacement".
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