Main Relay Inspection

2004 Suzuki Aerio LX, AWD, AutomaticSECTION Main Relay Inspection
  1. Disconnect negative cable at battery.
  2. Remove main relay (1) from relay box (2).
    Fig 1: Removing Main Relay From Relay Box
    G00784655Courtesy of SUZUKI OF AMERICA CORP.
  3. Check resistance between each two terminals as follows. If check results are as specified, proceed to next operation check. If not, replace.

    Main relay resistance 

    Between terminals "A" and "B": infinity (Infinity)

    Between terminals "C" and "C": 160 - 240 ohm

    Fig 2: Checking Main Relay Resistance Between Terminals
    G00784656Courtesy of SUZUKI OF AMERICA CORP.
  4. Check that there is continuity between terminals "A" and "B" when battery is connected to terminals "C" and "D". If found defective, replace.
    Fig 3: Checking Continuity Between Terminals "A" & "B"
    G00784657Courtesy of SUZUKI OF AMERICA CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.