Checking Coolant Fan 2 V177 (right)

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Fuses for Coolant Fan 2 V177 and Coolant Fan Control (FC) Control Module 2 J671 OK → Electrical Wiring Diagrams, Troubleshooting and Component Locations.

Remove front bumper cover →
- 63 BUMPER
- 63 - BUMPERS for BODY EXTERIOR - CABRIOLET
.

Fig 1: Connecting Multimeter With Measuring Probes And Connector Adapters From Connector Test Kit V.A.G 1594 C (Harness Connector For Coolant Fan 2 V177 Remains Connected)

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Connect multimeter with measuring probes and connector adapters from connector test kit V.A.G 1594 C between terminal - 1 - and terminal - 2 - ; harness connector for Coolant Fan 2 V177 remains connected.

Vehicle Diagnostic, Testing and Information System VAS 5051 connected, "Vehicle Self-Diagnosis" and vehicle system "01 Engine electronics" selected. The ignition must be switched on.

Fig 2: Diagnostic System VAS 5051: Display

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Display on VAS 5051 :

In selection - 1 - , click on function "03 - output Diagnostic Test Mode (DTM)".
Press → key repeatedly, until "coolant fan activation 2" is activated.

Voltage value must increase up to approx. 9 volts

End function "03 - output Diagnostic Test Mode (DTM)" by pressing ← button.
Select "06 - End Output".
Switch off ignition.

If specified value is reached but fan does not run:

Replace Coolant Fan 2 V177 → Coolant Fan 2 V177 (right), removing and installing .

If specification is not obtained:

Bring lock carrier into service position → Lock carrier, moving into service position .

Fig 3: Removing Coolant Fan Control (FC) Control Module 2 J671 On Left Front Longmember

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Remove Coolant Fan Control (FC) Control Module 2 J671 on left front longmember - arrows -.
Disconnect electrical harness connector - 2 - on Coolant Fan Control (FC) Control Module 2 J671.

Fig 4: Identifying Harness Connector Terminal

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Connect multimeter for voltage measurement as follows.

Harness connector Terminal	Measure to
- 1 -	Battery positive (B+)
- 2 -	Engine Ground (GND)

Specification: approx. battery voltage respectively

If specifications are not obtained:

Repair wire connection if necessary.

If specified values are achieved:

Fig 5: Disconnecting Electrical Harness Connector On Coolant Fan Control (FC) Control Module 2 J671

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical harness connector - 1 - on Coolant Fan Control (FC) Control Module 2 J671.

Fig 6: Identifying 6-Pin Electrical Harness Connector & Terminals

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Connect multimeter between terminal - 1 - and - 2 - of harness connector for voltage measurement.

Vehicle Diagnostic, Testing and Information System VAS 5051 A connected, "Vehicle Self-Diagnosis" and vehicle system "01 Engine electronics" selected. The ignition must be switched on.

Fig 7: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051 :

In selection - 1 - , click on function "03 - output Diagnostic Test Mode (DTM)".
Press → button repeatedly, until "coolant fan activation 2" is activated.

Voltage value must decrease slowly from approx. battery voltage to approx. 8 volts (and then increase again)

End function "03 - output Diagnostic Test Mode (DTM)" by pressing ← button.
Select "06 - End Output".
Switch off ignition.

If specification is not obtained:

Fig 8: Connecting Test Box VAG1598/31 To Engine Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect test box V.A.G 1598/31 to wiring harness connectors, Engine Control Module (ECM) is not connected. Connect Ground (GND) clip at test box to Ground (GND) (not visible in illustration) → 24 MULTIPORT FUEL INJECTION (MFI) .

CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.

Fig 9: Identifying 6-Pin Electrical Harness Connector & Terminals

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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal	Test box V.A.G 1598/31 Socket
- 2 -	104

Repair wire connection if necessary.

If no malfunctions are detected:

Fig 10: Disconnecting Electrical Harness Connector For Right Fan

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Check wire connection from Coolant Fan Control (FC) Control Module 2 J671 to harness connector on longmember - arrow -.

If no malfunctions are detected in wiring:

Replace Coolant Fan Control (FC) Control Module 2 J671.