B1073

B1073 - Rear Blower Control Request Input Circuit High

For a complete wiring diagram, refer to.

• When Monitored: With the ignition on.

• Set Condition: If the A/C heater control detects voltage less than a calibrated value for a specified amount of time on the rear blower control 5 volt source circuit.






• This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored.

Test Step 1 - Verify the DTC is Active

• Turn the ignition ON.

• With the scan tool, erase A/C heater control DTCs.

• Turn the ignition OFF, wait 10 seconds, and turn the ignition ON.

• With the scan tool, read A/C heater control DTCs.

Does the scan tool display this DTC as active?

Yes

• Go to Test Step 2 => [ Test Step 2 - Check Rear Blower Control 5 Volt Source Circuit for
a Short to Voltage ]

No

• Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 2 - Check Rear Blower Control 5 Volt Source Circuit for a Short to Voltage






• Turn the ignition OFF.

• Disconnect the A/C heater control C2 harness connector.

• Turn the ignition ON.

• Measure the resistance between ground and the rear blower control 5 volt source circuit in the rear A/C heater control 8 way harness connector.

Is the voltage more than 6.0 volts?

Yes

• Repair the rear blower control 5 volt source circuit for a short to voltage.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Replace the A/C heater control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test