B1073

B1073-REAR BLOWER CONTROL REQUEST INPUT CIRCUIT HIGH (MTC)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .


- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater control detects voltage below a calibrated value for a specified amount of time on the (C800) Rear blower control 5 volt source circuit.







NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. Heating-A/C System Diagnostics


Diagnostic Test


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 2


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 BODY VERIFICATION TEST - VER 1.Body Verification Test.


2. CHECK (C800) 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 (C800) Rear Blower Control 5 Volt Source circuit in the Rear A/C Heater Control 8 way harness connector.
Is the voltage above 6.0 volts?

Yes


- Repair the (C800) Rear Blower Control 5 Volt Source circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.