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DTC 26, LCD Blanking Control Circuit Shorted To Battery Or CCM Internal Open: Testing

  1. Note all stored current and history codes. Turn ignition switch to OFF position. Remove instrument cluster to expose cluster harness connector located in instrument panel carrier. Using adapter from Terminal Test Adapter Kit (J 35616-A), connect DVOM between cluster harness connector terminal A13 and ground. Turn ignition switch to ON position. Measure voltage. If battery voltage is present, repair short to battery in LCD blanking control circuit. If voltage is about 2-5 volts, go to step 3). If voltage is zero volts, go to next step.
  2. Check for DTC 27. If DTC 27 is present, repair open in LCD blanking control circuit. If DTC 27 is not present, go to next step.
  3. Connect Red leads of Signal Generator/Instrumental Panel Tester (J 33431-B) to DVOM. Using ohmmeter feature of DVOM, set resistance on tester to 1150-1250 ohms by turning adjustment dials. Turn ignition switch to OFF position. Disconnect DVOM from tester. Using adapters from adapter kit, connect one lead of tester to cluster harness connector terminal A13 and other lead to terminal A16. Install Tech 1. Turn ignition switch to ON position. Using Tech 1, read CCM DTCs. If DTC 26 resets, replace CCM. If DTC 26 does not reset, go to next step.
  4. Check for intermittents in LCD blanking control circuit. If fault is present, LCD portion of instrument cluster will be blank. If code is set as history, problem may be intermittent. Try to recreate fault while performing test by wiggling wiring and connectors. Check for poor connections at all connectors that may be causing intermittent condition. If wiring and connections are okay, replace instrument cluster.
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