Manual Temperature Control

B210D - System Voltage High

For a complete wiring diagram, refer to.

• When Monitored: With the ignition switch on.

• Set Condition: The A/C heater control has detected the system voltage more than a calibrated value.






Test Step 1 - Verify the DTC is Active

• Diagnose any related Powertrain DTCs before continuing.

• Turn the ignition switch ON.

• With a scan tool, read and record DTCs.

• With the scan tool, clear DTCs.

• Turn the ignition switch OFF, and then ON.

• Using the scan tool, read DTCs.

Does the DTC reset?

Yes

• Go to Test Step 3 => [ Test Step 3 - Check Fused Ignition Switch Output (Run-Start) Circuit
for a Short to Battery Voltage ]

No

• Go to Test Step 2 => [ Test Step 2 - Intermittent Condition ].

Test Step 2 - Intermittent Condition

• Check for any of the follow conditions:

• Poor wire to terminal connection

• Corroded terminals

• Backed out or loose terminals

• Broken wire internal to the insulation

• Dirty (partial) module ground

• With the ignition on, wiggle the related wires.

• Using a scan tool, read DTCs.

Does the DTC reset?

Yes

• Repair the wiring as necessary.

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

No

• The conditions that caused this DTC to set are not active at this time. Test complete.

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

Test Step 3 - Check Fused Ignition Switch Output (Run-Start) Circuit for a Short to Battery Voltage

• A dirty (partial) ground can cause abnormal conditions within a system. Make sure the module has a good ground before continuing.

• Turn the ignition OFF.

• Disconnect the A/C heater control C1 harness connector.

• Using a 12 volt test lamp connected to ground, probe the fused ignition switch output (Run-Start) circuit in the A/C heater control C1 harness connector.

Does the test lamp illuminate brightly?

Yes

• Repair the fused ignition switch output (Run-Start) 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