Test sequence

WARNING: This page is about a different variant/trim than selected.

Pull 2-pin connector off After-Run coolant pump -V51- -arrow-.
Connect contacts of After-Run coolant pump -V51- to battery using aux. cables from V.A.G. 1594. After-run coolant pump must run.
If the after-run coolant pump does not run:

Fig 1: Connecting After-Run Coolant Pump To Battery
Courtesy of VOLKSWAGEN OF AMERICA, INC.
Replace After-Run coolant pump -V51-.
If the After-Run coolant pump -V51- runs:
Switch ignition off and on again.
Connect VAG 1527B voltage tester to disconnected connector for after-run coolant pump (V51) with auxiliary cable from V.A.G. 1594 A LED must light up.
NOTE: This check must be performed within 5 minutes after switching ignition off.

Fig 2: Connecting Voltage Tester To After-Run Coolant Pump
Courtesy of VOLKSWAGEN OF AMERICA, INC.

If the LED does not light up:
Locate and repair open circuit using wiring diagram.