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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) >> Diagnosis & Testing >> Function Test >> Test Procedure

Test Procedure

  1. Place transmission in Park, turn ignition off and wait at least 6 seconds. Turn ignition on (engine off) and watch 3 shift select buttons. If all 3 buttons blink once, go to next step. If all 3 buttons do not blink once, go to step  2 under TEST RESULTS .
  2. During step 1)  , if one button stayed lit to indicate transfer case shift position, go to next step. If one button did not stay lit, go to step  4 under TEST RESULTS .
  3. Shift transfer case to 4HI, to 2HI, then back to 4HI. If transfer case mode shifts between 4HI and 2HI, go to next step. If transfer case mode does not shift between 4HI and 2HI, go to step  5 under TEST RESULTS .
  4. Apply parking brake. Place transmission in Park (A/T) or 1st gear (M/T). Turn ignition on (engine off). Place transfer case in 4HI position. Press 4LO shift select button. If 4LO shift select button blinks for 30 seconds then stops when 4HI button illuminates, go to next step. If button blinking does not respond as indicated, go to step  7 under TEST RESULTS .
  5. Turn ignition on (engine off). Shift transfer case to 4HI position and press 4LO shift select button while noting blinking. Place transmission in Neutral (A/T) or push clutch to floor (M/T). If 4LO shift select button stops blinking and stays lit when transmission is shifted as indicated, go to next step. If 4LO button does not respond as indicated, go to step  7 under TEST RESULTS .
  6. Press transfer case 2HI shift select button and shift transfer case to 2HI position. Place transmission in Park (A/T) or 1st gear (M/T). Turn ignition off. Using a jumper wire, ground DLC pin No. 13. Turn ignition on (engine off). If all 3 shift select buttons blink once then stay off, test is complete, system is functioning normally. If all 3 shift select buttons do not respond as indicated, go to step  8 under TEST RESULTS .
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