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CHECK GEARBOX Warning Light

  1. Disconnect Main Instrument Unit (MIU) 20-pin connector at rear of instrument cluster. See Figure . Connect test light between 20-pin connector terminal No. 6 (Blue/Gray wire) and battery positive voltage. Turn ignition on. Using scan tool, contact Transmission Control Module (TCM) and check GEARBOX light. If test light comes on, replace bulb. After repair, go to next step. If test light does not come on, repair open circuit in Blue/Gray wire between 20-pin connector terminal No. 6 and TCM connector terminal No. 6. After repair, go to step  3 .
  2. Clear DTCs. Use scan tool to perform a functional test of GEARBOX warning light. If warning light functions, system is okay. If warning light does not function, replace MIU ECU. See ELECTRONIC CONTROL UNIT (ECU)  under REMOVAL & INSTALLATION.
  3. Clear DTCs. Perform a functional test of TCM. If TCM functions, system is okay. If TCM does not function, replace TCM.
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