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Home >> Saab >> 2011 >> 9-5 Turbo6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting And Signaling Systems >> Fault diagnosis, fault codes >> DTC B257C: Left Headlamp Assembly Malfunction or B257D: Right Headlamp Assembly Malfunction >> Component Testing >> Relay Test

Relay Test

  1. Ignition OFF, disconnect the KR49 Headlamp Low Beam Relay.
  2. Test for 60-180 Ω between terminals 1 and 2.
  3. If the resistance is not within the specified range, replace the KR49 Headlamp Low Beam Relay.
  4. Test for infinite resistance between the following terminals:
    • 1 and 3
    • 3 and 5
    • 2 and 5
    • 1 and 3
  5. If not the specified value, replace the KR49 Headlamp Low Beam Relay.
  6. Install a 15 A fused jumper wire between relay terminal 1 and 12 V. Install a jumper wire between relay terminal 2 and ground. Test for less than 2 Ωbetween terminals 3 and 5.
  7. If greater than the specified range, replace the KR49 Headlamp Low Beam Relay.
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