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Home >> Chevrolet >> 1999 >> Blazer 4D Utility, 4WD, Automatic >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Case - Diagnosis - New Venture 233 (SELECTABLE 4WD) >> Symptom Tests >> 1 Or 2 Shift Select Buttons Do Not Light

1 Or 2 Shift Select Buttons Do Not Light

  1. If referred here from another test, go to next step. If diagnostic started here, perform FUNCTION TEST , then go to next step.
  2. Turn ignition off for at least 6 seconds, then turn ignition on (engine off). If mode and range shifts can now be made, go to next step. If mode and/or range shifts cannot be made, see REDUCED OR NO MODE & RANGE SHIFT OPERATION .
  3. If 2HI button will not light, check for open in Light Green/Black wire between shift select switch and TCCM connector. If 4HI button will not light, check for open in Tan/Black wire between shift select switch and TCCM connector. If 4LO button will not light, check for open in Purple/White wire between shift select switch and TCCM connector. Repair open circuit(s) as found, then go to next step. If no open circuits are found, go to step  5.
  4. After repairs, see FUNCTION TEST  under DIAGNOSIS & TESTING.
  5. If 2HI button does not light, check for battery voltage at TTCM connector Terminal C11 (Light Green/Black wire). If 4HI button does not light, check for battery voltage at TCCM connector C12 (Tan/Black wire). If 4LO button does not light, check for battery voltage at TCCM connector terminal C14 (Purple/White wire). If battery voltage exists at pin checked, go to step  8. If battery voltage does not exist at pin checked, go to next step.
  6. If 2HI button will not light, check for open in Light Green/Black wire between shift select switch and TCCM connector. If 4HI button will not light, check for open in Tan/Black wire between shift select switch and TCCM connector. If 4LO button will not light, check for open in Purple/White wire between shift select switch and TCCM connector. If open circuit(s) are found, go to next step. If no open circuits are found, go to step  8.
  7. Turn ignition off. Repair open circuit(s). When repair is complete, see FUNCTION TEST  under DIAGNOSIS & TESTING.
  8. Turn ignition off. If 2HI button will not light, connect jumper wire from terminal C11 (Light Green/Black wire) to ground. If 4HI button will not light, connect jumper wire from terminal C12 (Tan/Black wire) to ground. If 4LO button will not light, connect jumper wire from terminal C14 (Purple/White wire) to ground. Turn ignition on (engine off). If shift select button lights for each grounded circuit, see RETRIEVING CODES  under DIAGNOSIS & TESTING. If shift select button does not light when grounded, go to next step.
  9. Replace shift select switch, then go to FUNCTION TEST  under DIAGNOSIS & TESTING.
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