Main Relay Testing: Notes

Check Voltage Supply At Battery
Test for Voltage at Fuse 34 (With key on)
Check Voltage at KL 30 of Main Relay
Check operation of Relay (Using relay adapter)
- Ground signal from EMS2000
- Voltage Drops across Relay (Relay Energized and Not Energized)
Perform TEST PLAN on Power Supply

Fig 1: Main Relay Testing Procedure

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Fig 2: Underhood Fusebox

Courtesy of BMW OF NORTH AMERICA, INC.