Front seat height adjustment not working

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Seats › Front seat height adjustment not working

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Fault diagnosisFront seat height adjustment not working

FRONT SEAT HEIGHT ADJUSTMENT NOT WORKING

The backrest electrical adjustment is not working / not working properly.

1	CHECK ON SWITCH STATUS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Select the following control unit at the diagnostic equipment: Driver''s/passenger seat control unit. Check the value of the following parameter: Seat lifiting switch and check that it indicates released when the switch is released and indicates pressed when the switch is pressed.	Move on to Step 5	There is no change in the status of the switch.	Move on to Step 2
2	CHECK ON WIRING CONNECTIONS AT SEAT LIFTING SWITCH	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the connection for the wiring at the electric seat control switch. Also check for any oxidation/impurities at the connector/switch.	Move on to Step 3	1.Switch wiring connector detached or badly positioned on seat mounting.	1.Fit connector correctly on switch.
		Move on to Step 3	2. Presence of oxidation/impurities at connector/control unit.	2.Eliminate oxidation/impurities at connector/switch.
3	CHECK ON WIRING CONNECTIONS AT CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the connection for the wiring at the electric seat control unit. Also check for any oxidation/impurities at the connector/control unit.	Move on to Step 4	1.Switch wiring connector detached or badly positioned on seat control unit.	1.Fit connector correctly on control unit
		Move on to Step 4	2. Presence of oxidation/impurities at connector/control unit	2.Eliminate oxidation/impurities at connector/control unit.
4	SEAT LIFTING SWITCH OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the seat lifting switch is working properly	Move on to Step 9	Seat lifiting switch not working correctly.	Replace the switch Op. 7045J50
5	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment connected, check: that the backrest actuator is working properly through active diagnosis.	Move on to Step 9	Seat lifiting actuator not working correctly.	Move on to Step 6
6	CHECK ON CONNECTION AT MOTOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the connection is correctly attached to the motor Also check for any oxidation/impurities at the connector/motor.	Move on to Step 7	1.Connectors at motor detached or badly positioned.	1.Fit connector correctly on motor
		Move on to Step 7	2.Presence of oxidation/impurities at connector/motor.	2.Eliminate oxidation/impurities at connector/motor.
7	CHECK ON ELECTRICAL SEAT WIRING	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the electric seat wiring	Move on to Step 8	Presence of cuts/tears to seat wiring.	Replace cut/broken wiring see wiring diagram See E3076 ELECTRICALLY-ADJUSTABLE SEATS
8	CHECK ON SEAT LIFITING ADJUSTMENT MOTOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the seat lifting movement motor is working properly.	Move on to Step 9	Seat lifting motor not working correctly.	Replace the backrest adjustment motor Op. 7045J30 FRONT SEAT LIFTING MOTOR, LEFT OR RIGHT - R.R. FOLLOWING ELECTRICAL WIRING CHECK
9	DRIVER''S/PASSENGER SEAT CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the driver''s/passenger seat control unit Op. 7045J36 SEAT MOVEMENT ECU R R FOLLOWING ELECTRICAL CIRCUIT CHECK	End of diagnosis	The fault persists	Contact technical service for further information on the problem.

Seat lifiting lever loose, detached/slipping

1	CHECK CONDITION OF LEVER ATTACHMENT SYSTEM	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the lever attachment system.	Move on to Step 2	1.Lever and/or ratchet retaining elements broken.	1. Replace the lever Op. 7045A56 DRIVER'S SEAT HEIGHT ADJUSTMENT DEVICE CONTROL LEVER - R.R
	Check the condition of the lever attachment system.	Move on to Step 2	2. Lever fixing bolt slack/thread stripped	2. Replace the bolt.
2	CHECK ON CONDITION OF RATCHET ATTACHMENT SYSTEM	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the seat lifting ratchet attachment system.	Move on to Step 3	Ratchet loose (fastening elements to seat frame).	Retighten the ratchet to the frame correctly.
3	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present.	End of diagnosis	The fault persists	Replace the seat lifting ratchet Op. 7045A36 DRIVER'S SEAT MANUAL HEIGHT ADJUSTMENT DEVICE - R.R

‹ Prev Head restraint height adjustment not working Next › Front seat lumbar adjustment not working

Parts & tools for this job Staging For 2005 Alfa Romeo 159

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