Jetta Sedan L5-2.5L (BGP) (2005)
Specified value: 12.5 V
If the specified value was not obtained:
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Check the Power Supply Relay (terminal 15) (J329) socket 5/D to the Generator (GEN) (C) terminal " L" for an open circuit or short to Ground
(GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking Ground (GND)
If the manufacturers test box is being used. Perform the following step.
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Install the Adapter Cable (121-pin) (VAG1598/31)24 Removal and Installation.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J220). Refer to --> [ Engine Control Module, Replacing ] See: Relays and Modules -
Computers and Control Systems/Engine Control Module/Service and Repair/Removal and Replacement/Engine Control Module, Replacing.
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Using a Multimeter, check the following wiring connection for resistance.
Specified value: 1.5 ohms.
If the specified value was not obtained:
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Check the Power Supply Relay (terminal 15) (J329) socket 4/85 to the Ground (GND) connection on left headlamp for an open circuit or a short to
Battery (+).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring and the voltage supply was OK:
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Replace the Power Supply Relay (terminal 15) (J329).
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Assembly is performed in the reverse of the removal.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Diagnostic Mode 04 - Erase DTC Memory.
3. If the DTC memory was erased, generate readiness code. Refer to --> [ Readiness Code ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes/Readiness Code.