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Home >> Cadillac >> 2018 >> Escalade ESV Platinum, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Transfer Case - Mp 3023/3024 (NQH)) >> Diagnostic Information And Procedures >> DTC B0785: 2WD HI Indicator Circuit Short >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Remove key. Disconnect the X1 connector at the transfer case shift control switch (TCSCS).
    NOTE: When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616  GM terminal test kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.
  2. Door open, key ON, engine OFF. Using the L-BU probe J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming control circuit, TCSCS X1 pin 4 and a good ground, such as the ground terminal of the EL-49742  harness, black terminal.
    • If the voltage is less than the specified range, test the affected circuit for an open/high resistance, short to ground or short to voltage. If all circuits and connections test normal, test the body control module (BCM) for proper operation.
  3. Using the L-BU probes J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming control circuit, TCSCS X1 pin 4 and the 2WD HI indicator control circuit, TSCSC X1 pin 8.
    • If the voltage is less than the specified range, test the 2WD HI indicator control circuit for an open/high resistance or short to power. If all circuits and connections test normal, test the TCCM for proper operation.
  4. Key OFF. Using the L-BU probe J 35616-64B, test for greater than 10 Ω between the indicator dimming control circuit, TCSCS X1 pin 4 and all other pins of the TCSCS X1.
    • If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.
  5. Using the L-BU probe J 35616-64B, test for greater than 10 Ω between the 2WD HI indicator control circuit, TCSCS X1 pin 8 and all other pins of the TCSCS X1.
    • If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.
  6. Test the TCSCS for proper operation.
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