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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information And Procedures >> DTC B0770: AWD Indicator Circuit >> Component Testing >> TCSCS

Component Testing: TCSCS

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  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) 8 7 9 10 3