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Home >> GMC >> 2017 >> Terrain SL, Gas >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Ignition Switch/Steering Lock >> Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B1370-B1379, B1380-B1389, or B1440-B1443: Control Module Ignition Circuits (Body Control Module) >> Component Testing
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Component Testing

  1. Ignition OFF, disconnect the harness connector at the S39 Ignition Switch.
  2. Using the Resistance Test below, verify the resistance between the terminals listed below match for each S39 Ignition Switch position.
    • If any reading is other than specified 

      Replace the S39 Ignition Switch.

    • If the readings match 
  3. All OK.
Resistance Test

Ignition Switch Position Terminals 1 and 2 Terminals 2 and 3 Terminals 2 and 4 Terminals 2 and 6 Terminals 4 and 6
OFF Key Out Infinite Infinite Infinite Infinite Infinite
OFF Key In Infinite Infinite <5.0 Ω Infinite Infinite
ACCESSORY Infinite <5.0 Ω Infinite Infinite Infinite
ON/RUN <5.0 Ω <5.0 Ω Infinite Infinite <5.0 Ω
CRANK <5.0 Ω Infinite Infinite Infinite 1275 - 1325 Ω
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