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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 B0780: 4WD LO Indicator Circuit Short >> Component Testing >> TCSCS

Component Testing: TCSCS

WARNING: This page is about a different variant/trim than selected.
  1. Using the L-BU probes J 35616-65B, connect the EL-49741  9 V+ power source harness to the TCSCS as specified below for the LED being tested. Connecting the harness in the opposite pins will not illuminate the LED.
  2. Connect a 9 V battery to the EL-49741  harness.
  3. Verify that only the indicator being tested illuminates.
    • If the indicator does not illuminate when tested or the incorrect indicator illuminates, replace the TCSCS.
EL49741 Wire Color 2WD HI 4WD Auto 4WD HI 4WD LO N
Red (pin) 4 4 4 4 2
Black (pin) 7 9 9 10 3
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