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Rear Blower Motor Speeds Incorrect

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the Rear Blower switch on the A/C-Heater Control Module off. Turn the ignition on. Turn the Power switch on the A/C-Heater Control Module on. If the rear blower runs, go to the next step. If the rear blower does not run, go to step  4.
  2. Turn the Rear Blower switch on the A/C-Heater Control Module off. Turn the Power switch on the A/C-Heater Control Module off. Turn the ignition off. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Turn the ignition on. Turn the Power switch on the A/C-Heater Control Module on. If the rear blower runs, go to the next step. If the rear blower does not run, replace the Rear Blower Rear Control Switch. See HVAC CONTROLS (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS article in HVAC.
  3. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Measure the resistance between ground and each of the Rear Blower Motor Driver circuits (Low, Medium, and High) in the Rear Blower Front Control Switch harness connector. If the resistance is less than 10K ohms on any of the circuits, repair all Rear Blower Motor Driver circuits with a resistance less than 10K ohms for a short to ground. If the resistance is more than 10K ohms on any of the circuits, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION.
  4. Turn the Rear Blower switch on the A/C-Heater Control Module off. Turn the Power switch on the A/C-Heater Control Module off: Turn the ignition off. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Turn the ignition on. Turn the Power switch on the A/C-Heater Control Module on. Turn the Rear Blower switch on the A/C-Heater Control Module to the Low, Medium, and High speed positions while listening for the rear blower motor to change speed accordingly. If the rear blower speed changes accordingly, replace the Rear Blower Rear Control Switch. See HVAC CONTROLS (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS article in HVAC. If the rear blower speed does not change accordingly, go to the next step.
    NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  5. Turn the Power switch on the A/C-Heater Control Module off. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Turn the ignition on. Turn the Power switch on the A/C-Heater Control Module on. Using a 12-volt test light connect to ground, back probe each of the Rear Blower Motor Driver circuits (Low, Medium, and High) in the Rear Blower Front Control Switch harness connector and in the Rear Blower Rear Control Switch C1 harness connector. If the test light illuminates brightly on each circuit, go to the next step. If the test light does not illuminate brightly on each circuit, go to step  10.
  6. Turn the Power switch on the A/C-Heater Control Module off. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Turn the ignition on Measure the voltage of each of the Rear Blower Motor Driver circuits (Low, Medium, and High). If there is voltage present on any of the circuits, repair all Rear Blower Motor Driver circuits with voltage present for a short to voltage. If there is no voltage present on any of the circuits, go to the next step.
  7. Turn the Power switch on the A/C-Heater Control Module off. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Turn the ignition on. Measure the voltage of the Rear Blower Motor Front Control Feed circuit. If there is any voltage present, repair the Rear Blower Motor Front Control Feed circuit for a short to voltage. If there is no voltage present, go to the next step.
  8. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Measure the resistance between the Rear Blower Motor Front Control Feed circuit and each of the Rear Blower Motor Driver circuits (Low, Medium, and High). If the resistance is less than 10 k/ohms on any of the circuits, repair all Rear Blower Motor Driver circuits with a resistance less than 10 k/ohms for a short to the Rear Blower Motor Front Control Feed circuit. If the resistance is more than 10 k/ohms on any of the circuits, go to the next step.
  9. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Disconnect the Rear Blower Motor Resistor Block harness connector. See Figure - Figure . Measure the resistance between the Rear Blower Motor Low circuit and the Rear Blower Motor Medium and High circuits. Measure the resistance between the Rear Blower Motor Medium circuit and the Rear Blower Motor High circuit. If the resistance is less than 10 k/ohms between any of the circuits, repair the shorted Rear Blower Motor Driver circuits. If the resistance is more than 10 k/ohms between any of the circuits, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION.
  10. Turn the ignition off. Disconnect the Rear Blower Front Control Switch harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C1 harness connector. See Fig 1. Disconnect the Rear Blower Motor Resistor Block harness connector. See Figure - Figure . Measure the resistance of each of the Rear Blower Motor Driver circuits (Low, Medium, and High) between the Rear Blower Motor Resistor Block harness connector and the Rear Blower Motor Front Control Switch harness connector. Measure the resistance of each of the Rear Blower Motor Driver circuits (Low, Medium, and High) between the Rear Blower Motor Resistor Block harness connector and the Rear Blower Rear Control Switch C1 harness connector. If the resistance is less than 5 ohms on each of the circuits, replace the Rear Blower Motor Resistor Block. See BLOWER MOTOR RESISTOR (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS article in HVAC. If the resistance is more than 5 ohms on each of the circuits, repair all Rear Blower Motor Driver circuit(s) with a resistance more than 5 ohms for an open.
Fig 1: Identifying Rear Blower Rear Control Switch C1 Connector
G00172153Courtesy of DAIMLERCHRYSLER CORP.
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