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No.
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TECH 1 Display
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Conditions for
Checking
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Nominal Value
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Trouble Codes
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Terminal
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13
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REAR HEIGHT POS.
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Ignition ON
Press rocker switch for rear height upwards and then
downwards
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13 % 0.14 V
to
94 % 4.67 V
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17
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3,
4, 5
5-pin
plug
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Note:
The value displayed alters constantly within the specified
range depending on the programmed end stops. The rear part of the seat moves
up and down.
If the motor is already at one of the two end stops, the
motor will only move again (i.e. the TECH 1 display will only change
again) when the above rocker switch is pressed in the other direction.
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The potentiometer and motor M72.2 for the seat rear height
are connected to control unit K103 by a 5-pin plug with the designation
"rear height". The potentiometer is wired with the three plug
terminals designated (x) and the motor is wired with the two plug terminals
designated (y).
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Notes on Trouble-shooting:
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Nominal Value:
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Cause of fault:
(If nominal value is not
attained)
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· Ignition OFF, disconnect battery
negative terminal
· Remove driver's seat
· Release 5-pin plug "rear
height" and disconnect from control unit K103
· Using multimeter, measure resistance in
5-pin plug between Ter. 3 (x) and Ter. 1 (x)
|
approx. 10 kW
|
· Potentiometer for motor M72.2
"rear height" defective (resistance path interruption)
· Lead interruption between 5-pin plug
Ter. 3 (x) and Ter. 1 (x) and potentiometer for M72.2
· Lead short circuit between 5-pin plug
Ter. 3 (x) and Ter. 1 (x) to potentiometer for M72.2
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· Using multimeter, measure resistance in
5-pin plug between Ter. 2 (x) and Ter. 3 (x)
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between 1 kW and
10 kW, depending on "seat
height, rear"
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· Lead interruption between 5-pin plug
Ter. 2 (x) and slider connection for potentiometer of M72.2
· Potentiometer for M72.2 defective
(slider has no contact)
· Lead short circuit between 5-pin plug
Ter. 3 (x) and Ter. 2 (x) to potentiometer of M72.2
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