Heated Seats, Troubleshooting

Special tools and workshop equipment required

Digital multimeter Fluke 83 (US 1119)
Connector test kit:VW 1594

NOTE:

Always refer to appropriate wiring diagram.

Test Conditions

Battery OK.
Fuse 14 OK.
Heated seat circuit breaker -S79- in auxiliary relay panel I (plenum chamber, left side), position A5 OK.

WARNING:

DO NOT damage, enlarge or bend connector terminals or cavities by forcing probes into them when performing electrical checks. Use connector test kit VW 1594 to make the necessary electrical connections.

A

	Power Supply at Heated Seat Element Switch Connector, Checking
	-- Remove heated seat element control switch (driver or passenger side).-- Remove connector from control switch.-- Set multimeter to measure voltage and connect red test lead to terminal 4 of connector and black test lead to ground (GND). Must read approximately 12 volts. -- Connect red test lead to terminal 4 and black test lead to terminal 6 of connector. Must read approximately 12 volts. -- Connect red test lead to terminal 1 and black test lead to terminal 6 of connector.-- Switch ignition ON. Must read approximately 12 volts. -- Switch ignition OFF.-- Connect red test lead to terminal 5 and black test lead to terminal 6 of connector.-- Switch ignition ON. Must read approximately 12 volts
	One or more specified values NOT OK		All specified values OK

		Go to A1 next page		Go to B

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	A1

	-- Check and repair wiring according to wiring diagram, or -- Check continuity of heated seat circuit breaker -S79- Located in auxiliary relay panel I (plenum chamber, left side), position A5 -- Replace circuit breaker if necessary

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B

	Seat Temperature Sensor, Checking Continuity
	-- Set multimeter to measure resistance (Ω), and connect test leads between terminals 3 and 6 of plug connector for heated seat element control switch. Must read approximately 10 K Ω at ambient temperature of 20°C (68°F). Note: Heated seat element and temperature sensor are one unit.
	Specified values NOT OK		Specified value OK

		Go to B1 next page		Go to C

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B1

	-- Disconnect 6-point connector (green) from under front of seat.-- Unclip connector from bracket on seat frame.-- Connect multimeter test leads between terminals 2 and 4 of 6-point connector. Must read approximately 10 K Ω at ambient temperature of 20°C (68°F).
	Specified values NOT OK		Specified value OK

	-- Replace heated seat element.			-- Check and repair wiring according to wiring diagram.


		End			End

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C

	Heated Seat, Checking Continuity to Seat
	-- Set multimeter to Ohm range and connect test leads between terminals 2 and 6 of the disconnected harness connector for the heated seat element control switch (driver or passenger side). Must read approximately 2.4 Ω
	Specified values NOT OK		Specified value OK

	-- Check and repair wiring according to wiring diagram, or -- Check continuity to individual front seat heater elements (seat bottom, backrest), rear seat elements and switch. Refer to HEATED SEAT CIRCUIT BREAKER, CHECKING .			End






		End