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CHAPTER 40

CHAPTER 40. Body Electrical System. Checking for Module Communication Errors Using a Scan Tool. 40-1.

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CHAPTER 40

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  1. CHAPTER 40 Body Electrical System

  2. Checking for Module Communication Errors Using a Scan Tool 40-1 • After researching the correct procedure in the manufacturer's information, locate the DLC and connect the scan tool. Power on the scan tool and turn the ignition on. Establish scan tool communications with the vehicle.

  3. Checking for Module Communication Errors Using a Scan Tool 40-1 • Check fault codes using the scan tool, and follow the diagnostic procedure in the service information. Check to see if any modules are inactive, or not listed as active, that should be.

  4. Checking for Module Communication Errors Using a Scan Tool 40-1 • Command the module to take the appropriate action and observe the response. If you do not receive the proper response, refer to the service information for the diagnostic procedure.

  5. Performing Software Transfers, Software Updates, or Flash Reprogramming on Modules 40-2 • Obtain the latest vehicle software program updates from the manufacturer, and load the updates into the flash programmer. Connect a battery support unit to the vehicle.

  6. Performing Software Transfers, Software Updates, or Flash Reprogramming on Modules 40-2 • Locate the DLC. Connect and power on the flash program tool. Turn the ignition on.

  7. Performing Software Transfers, Software Updates, or Flash Reprogramming on Modules 40-2 • Establish flash program tool communication with the vehicle.

  8. Performing Software Transfers, Software Updates, or Flash Reprogramming on Modules 40-2 • Identify the vehicle modules to be updated, and use the flash program tool to perform software transfers, software updates, or flash reprogramming.

  9. Performing Software Transfers, Software Updates, or Flash Reprogramming on Modules 40-2 • Disconnect the flash programmer and check the vehicle's functionality.

  10. Testing the Electric Motor 40-3 • Research circuit operation and circuit diagrams for the motor driven accessory requiring repair from the manufacturer's information. Measure and record the voltage at the battery.

  11. Testing the Electric Motor 40-3 • Use a DVOM to measure the power and ground at the motor while it is being operated. If the voltage reading is more than 1.0 volt lower than battery voltage, perform voltage drop tests on each side of the circuit to determine which side has the fault.

  12. Testing the Electric Motor 40-3 • Once the faulty side has been identified, measure the voltage drop on each section of the circuit to locate the high resistance. If the total power and ground voltage to the motor was within 1.0 volt of battery voltage, there is a fault in the motor. Determine any necessary actions.

  13. Testing the Horn System 40-4 • Confirm that the horn does not operate. Research circuit operation and circuit diagrams for the horn from the service information. Check for power and ground at horn when the horn switch is operated. If power and ground are present, the horn is faulty and needs to be replaced.

  14. Testing the Horn System 40-4 • If there is no power to the horn, remove the relay and check for battery voltage at terminal 30 (or 3). If battery voltage is not present, check the horn fuse and the rest of the feed circuit.

  15. Testing the Horn System 40-4 • If battery voltage is present, jump terminal 30 (or 3) to terminal 87 (or 5). The horn should honk. If it doesn't, check for an open wire between terminal 87 and the horn with a DVOM.

  16. Testing the Horn System 40-4 • If the horn now honks, check that either terminal 85 or 86 has battery voltage. If one does, then the other should be the horn switch leg.

  17. Testing the Horn System 40-4 • Connect a DVOM between the switch leg terminal and ground. Operate the horn switch; resistance should decrease to less than an ohm. If it doesn't, search out the high resistance or open circuit back to the horn switch. Suspect either the clock spring or the horn switch itself.

  18. Testing the Horn System 40-4 • If the switch leg is good, measure the resistance between terminals 85 and 86 on the horn relay itself. The resistance should be between about 40 and 100 ohms. If not, replace the relay.

  19. Testing the Horn System 40-4 • If the resistance is good, either measure the voltage drop across the switch contacts of the relay (30 and 87) or substitute a known good relay.

  20. Removing the Door Panel 40-5 • Research removal and reinstallation of the door panel from the manufacturer's service information. Remove fixtures such as the arm rest.

  21. Removing the Door Panel 40-5 • Remove the switch panel.

  22. Removing the Door Panel 40-5 • Remove the cables, and carefully pry the panel from the frame.

  23. Removing the Door Panel 40-5 • Remove the inner liner from the frame, preserving it for reuse.

  24. Removing the Door Panel 40-5 • Reinstall the door panel using the reverse procedure while ensuring all electrical connections are reinstalled.

  25. Testing the Washer System 40-6 • Check for the correct solution level in tanks, and listen for washer pump operation.

  26. Testing the Washer System 40-6 • If an electrical fault is indicated by lack of a washer motor sound, check for battery voltage and ground at the pump, when it is activated.

  27. Testing the Washer System 40-6 • If the power or ground circuit is faulty, perform voltage drop tests on the faulty side, until the fault is located.

  28. Testing the Washer System 40-6 • If the power and ground circuits are good, measure the resistance of the pump motor and compare to specifications.

  29. Testing the Washer System 40-6 • If the pump spins when activated but does not pump washer fluid, check the hoses and nozzles for obstructions. Blow out with compressed air if necessary.

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