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*NO RESPONSE FROM A/C HEATER CONTROL MODULE (CONTINUED) 7. DISCONNECT MODULES Note: The Instrument Cluster, Universal Garage Door Opener/Tire T . If one of these modules keeps the SCI Transmit circuit artificially high or low, the T will not be able to communicate with any of the four modules. Note: Perform the following steps for each of the modules until Disconnect each of the modules noted above, one at a time. Turn the ignition on. Using the DRB III T , attempt to communicate with any of the three modules still connected. Is the DRB III T able to communicate with the module selected? Yes >> Replace the module that was disconnected when communication was restored to the other two mod- ules. Perform BODY VERIFICATION TEST. No >> Go to 8 8. SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the harness connectors for the IC, UGDO/TPM, A/C Turn the ignition on. Measure the voltage of the SCI Transmit circuit at the A/C Heater Con- Is the voltage below 0.5 volt? Yes >> Go to 9 No >> Repair the SCI Transmit circuit for a short to voltage. Perform BODY VERIFICATION TEST. ZH ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS 8E - 33 |