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Circuit/System Testing

NOTE:

If DTC B3950 02 or B3951 02 are set fuse block underhood BCM fuse 32 may be open. Test circuit and fuse before replacing BCM.

  1. Ignition OFF, disconnect the harness connector at the appropriate E4 turn signal lamp.
  2. Test for less than 5 Ω between the ground circuit terminal F and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal B and ground.
  4. Command the appropriate Rear Turn Signal Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.
  5. If all the circuits test normal, replace the E4 turn signal lamp.
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