Workshop Manuals Factory service & repair

Alfa Romeo 159 Factory Service Manual (2005-2011)23 · Fault diagnosis

23 · Diagnostics

Knock on front seat cushion

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Noise / vibrations › Knock on front seat cushion

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Fault diagnosisKnock on front seat cushion

KNOCK ON FRONT SEAT CUSHION

Electric seats

Noise/knocking

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	"Rock" in the seat resting against the backrest; check the fastenings to the floor (two M8 bolts) releasing the tension and check the front mountings.	Move on to Step 1	Creaking; non alignment of guides during sliding stage (twist effect).	Retighten the seat to the floor following the correct guide alignment cycle.
1	CHECK ON FAULTY CONTACTS AT GUIDE BAYONETS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the seat from the floor and check for possible irregular contacts at the guide bayonets (front).	Move on to Step 2	Noise disappears	Check the plastic inserts on the floor and lubricate the bayonet area with grease.
2	CHECK ON GUIDE FASTENINGS TO SEAT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the fastenings of the guides to the seat (6 M8 bolts) if the noise disappears.	Move on to Step 3	Noise disappears	Retighten the seat to the floor following the correct tightening cycle.
3	SEAT LIFTING HINGES CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for clearance at the seat lifting hinges and for noise at the torsion spring.	Move on to Step 4	1. Excessive clearance in the seat lifting hinges.	1. Replace the seat frame Op. 7045A86 FRONT SEAT FRAME (ONE), LEFT OR RIGHT, R.R.
		Move on to Step 4	2. Noise from torsion spring.	2. Lubricate the torsion spring and check the condition of the bush.
4	BRACKET CONTACT CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the presence of contacts or detachment of the bracket.	Move on to Step 5	1. Contact with cushion components	1. Move the bracket away from possible contact with the cushion.
		Move on to Step 5	2. Detachment of the bracket	2. Replacement of connector holder bracket.
5	CHECK ON FASTENING OF MOTORS TO FRAME	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the bolts securing the motors to the frame are correctly tightened.	Move on to Step 6	Bolts missing/slack on the casing securing the motor to the frame	Retighten the motor to the correct torque.
6	PULLMAFLEX FASTENINGS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for possible detachment of the pullmaflex fastenings on the frame or possible breaks.	End of diagnosis	Pullmaflex released, pullmaflex fastening tabs open or broken.	Reattach pullmaflex and tighten fastening tabs or replace pullmaflex.

All versions

Noise/knocking

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	"Rock" in the seat resting against the backrest; check the fastenings to the floor (two M8 bolts) releasing the tension and check the front mountings.	Move on to Step 1	Creaking; non alignment of guides during sliding stage (twist effect).	Retighten the seat to the floor following the correct guide alignment cycle.
1	CHECK ON FAULTY CONTACTS AT GUIDE BAYONETS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the seat from the floor and check for possible irregular contacts at the guide bayonets (front).	Move on to Step 2	Noise disappears	Check the plastic inserts on the floor and lubricate the bayonet area with grease.
2	CHECK ON GUIDE FASTENINGS TO SEAT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the fastenings of the guides to the seat (6 M8 bolts) if the noise disappears.	Move on to Step 3	Noise disappears	Retighten the seat to the floor following the correct tightening cycle.
3	SEAT LIFTING HINGES CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for clearance at the seat lifting hinges and for noise at the torsion spring.	Move on to Step 4	1. Excessive clearance in the seat lifting hinges.	1. Replace the seat lifting assembly Op. 7045A36 DRIVER'S SEAT MANUAL HEIGHT ADJUSTMENT DEVICE - R.R
		Move on to Step 4	2. Noise from torsion spring.	2. Lubricate the torsion spring and check the condition of the bush.
4	BRACKET CONTACT CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the presence of contacts or detachment of the bracket.	Move on to Step 5	1. Contact with cushion components	1. Move the bracket away from possible contact with the cushion.
		Move on to Step 5	2. Detachment of the bracket	2. Replacement of connector holder bracket.
5	PULLMAFLEX FASTENINGS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for possible detachment of the pullmaflex fastenings on the frame or possible breaks.	End of diagnosis	Pullmaflex released, pullmaflex fastening tabs open or broken.	Reattach pullmaflex and tighten fastening tabs or replace pullmaflex.

‹ Prev Noise in front seat adjustment Next › Backrest adjustment noise

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

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