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Home >> Suzuki >> 2009 >> XL7 Limited, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Lighting Systems) >> Diagnostic Information and Procedures >> Turn Signal Lamps and/or Indicators Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

Turn Signal/Multifunction Switch Circuit Test. 

  1. Ignition OFF, disconnect the X2 harness connector at the turn signal/multifunction switch.
  2. Verify that a test lamp illuminates between the ground circuit terminal B and B+.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Left Turn Signal Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal G for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Right Turn Signal Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal H for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal G and the ground circuit terminal B. Verify the scan tool Left Turn Signal Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3A fused jumper wire between the signal circuit terminal H and the ground circuit terminal B. Verify the scan tool Right Turn Signal Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the turn signal/multifunction switch.

Turn Signal Circuit Test. 

  1. Ignition OFF, disconnect the X4 harness connector at the BCM.
  2. Ignition ON, verify a test lamp illuminates between the following B+ terminals and ground.
    • B+ terminal 1
    • B+ terminal 2
    • B+ terminal 3
      • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the B+ circuit and the respective turn signal circuits for a short to ground.
  3. Ignition OFF, disconnect the harness connector at the inoperative turn signal lamp.
  4. Test for less than 5.0 ohms of resistance between the ground circuit listed below and ground.
    • Chevrolet front turn signal - terminal 2
    • Pontiac front turn signal - terminal 3
    • Suzuki left front turn signal - terminal G
    • Suzuki right front turn signal - terminal 3
    • Chevrolet and Pontiac rear turn signal - terminal GRND
    • Suzuki rear turn signal - terminal G
      • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Connect a test lamp between the supply voltage circuit listed below and the ground circuit.
    • Chevrolet or Pontiac front turn signal - terminal 1
    • Suzuki left front turn signal - terminal MIN
    • Suzuki right front turn signal - terminal 1
    • Chevrolet and Pontiac rear turn signal - terminal Minor
    • Suzuki rear turn signal - terminal MIN
  6. Ignition ON, command the inoperative turn signal 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 supply voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the appropriate turn signal lamp assembly.
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