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Home >> Jeep >> 2022 >> Gladiator Mojave, Part Time T/Case Control, Standard Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating & Air Conditioning - DTCS B1030-11 To B11C2-92 >> DTC Troubleshooting >> B10E8-14 - Blower Motor Control-Circuit Short To Ground Or Open >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read DTCs and record on the repair order.
    2. Record the Environmental Data.
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read HVAC Module DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. ISOLATE AND CHECK THE (C7) BLOWER MOTOR SUPPLY CIRCUIT FOR VOLTAGE 
    1. Turn the Ignition off.
    2. Disconnect the Blower Motor Power Module C1 harness connector.
    3. Turn the Ignition on.
    4. With a 12-volt test light connected to ground, check the (C7) Blower Motor Supply circuit at the Blower Motor Power Module C1 harness connector.
    NOTE:

    The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

    Does the test light illuminate brightly?

    Yes 

    • Go To  3

    No 

    • Repair the circuit for an open or short to ground. Also check the Blower Motor Relay for proper operation.
    • Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  3. ISOLATE AND CHECK THE (C56) FRONT BLOWER PWM CONTROL CIRCUIT FOR A SHORT TO GROUND 
    1. The ignition must be off when checking a circuit for continuity to ground.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connectors containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit. Check the disconnected connectors and related harnesses for damage, corrosion, and loose fitting terminals.
    3. Connect the negative lead of the Digital Volt-Ohm Meter (DVOM) to a known good ground.
    4. With the positive lead of the DVOM, probe the circuit being tested at the component harness connector and check for continuity between the circuit and ground.
    NOTE:

    When back-probing a circuit at a harness connector, always use an appropriate back probing tool to prevent damage to the connector terminals.

    Is there continuity between ground and the circuit being tested?

    Yes 

    • Repair the circuit for a short to ground. Use the wiring diagram as a guide to trace the circuit and identify any in-line connectors that may help isolate the location of the short.
    • Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .

    No 

    • Go To  4
  4. ISOLATE AND CHECK THE (C56) FRONT BLOWER PWM CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. The ignition must be off when checking the continuity of a circuit.
    2. Isolate the circuit by disconnecting the ECU and the component harness connectors containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit. Check the disconnected connectors and related harnesses for damage, corrosion, and loose fitting terminals.
    3. Before testing a circuit, measure the resistance between the two leads of the DVOM. Note:  Resistance in the meter leads can cause an error in the test results.
    4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
    5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
    NOTE:

    When back-probing a circuit at a harness connector, always use an appropriate back probing tool to prevent damage to the connector terminals.

    Is the resistance below 3.0 Ohms?

    Yes 

    • Go To  5

    No 

    • Repair the circuit for an open or high resistance.
    • Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  5. ISOLATE AND CHECK THE (Z910) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. The ignition must be off when checking the continuity of a circuit.
    2. Isolate the circuit by disconnecting the ECU and the component harness connectors containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit. Check the disconnected connectors and related harnesses for damage, corrosion, and loose fitting terminals.
    3. Before testing a circuit, measure the resistance between the two leads of the DVOM. Note:  Resistance in the meter leads can cause an error in the test results.
    4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
    5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
    NOTE:

    When back-probing a circuit at a harness connector, always use an appropriate back probing tool to prevent damage to the connector terminals.

    Is the resistance below 3.0 Ohms?

    Yes 

    • Go To  6

    No 

    • Repair the circuit for an open or high resistance.
    • Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  6. REPLACE THE BLOWER MOTOR POWER MODULE AND CHECK FOR THE DTC TO RETURN 
    1. Turn the ignition off.
    2. Replace the Blower Motor Power Module in accordance with the Service Information. Refer to MODULE, POWER, BLOWER MOTOR, REMOVAL AND INSTALLATION .
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read HVAC Module DTCs.

    Did the DTC return?

    Yes 

    • Go To  7

    No 

    • Replacing the Blower Motor Power Module corrected the condition.
    • Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  7. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all HVAC Module harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all HVAC Module harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read HVAC Module DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
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