Front seat backrest angle adjustment not working

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

‹ Prev Front seat sliding not working Next › Front seat adjustments (all) not working

Fault diagnosisFront seat backrest angle adjustment not working

FRONT SEAT BACKREST ANGLE 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: Backrest 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 BACKREST 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	BACKREST SWITCH OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the backrest switch is working properly	Move on to Step 9	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	Incorrect operation of backrest actuator.	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 CORRECT ENGAGEMENT OF PROPELLER SHAFTS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the backrest movement motor is working properly.	Move on to Step 9	Backrest adjustment motor not working properly	Replace the backrest adjustment motor Op. 7045J34 FRONT SEAT BACKREST ANGLE 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

Hardness during the adjustment of the backrest

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Operate the backrest adjustment knob without resting your back against the backrest and check whether the hardness persists.	End of diagnosis	1. Hardness disappears	1. Explain to the customer that the adjustment should be carried out without resting their back on the backrest.
		End of diagnosis	2. Hardness persists	2. Move on to Step 1
1	CHECKS ON KNOB ON COVER	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for interference with the cover (knob on cover).	Move on to Step 2	Presence of interference at the knob on the cover.	Remove the interference and check that the regulator is working properly.
2	CHECKS ON THE SEAT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the seat from the vehicle Op. 7045A10 FRONT SEAT (ONE), LEFT OR RIGHT - R.R. remove the side cauterization (left and right), release the joints and check for the presence of paint lumps and/or machining residues	Move on to Step 3	Presence of paint lumps and/or machining residues.	Eliminate the foreign bodies, lubricate and run in with at least five complete operating cycles.
3	CHECK ON THE CORRECT PHASING OF THE BACKREST ADJUSTERS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the phasing of the backrest adjusters is correct by moving the backrest.	Move on to Step 4	The backrest moves with a sinusoidal movement	Partly release the joint connecting rod (removing the washer fitted on the rod) and rephase the adjusters.
4	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 frame Op. 7045A86 FRONT SEAT FRAME (ONE), LEFT OR RIGHT, R.R.

‹ Prev Front seat sliding not working Next › Front seat adjustments (all) not working

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

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.