Auto High Beam Module (AHBM)

B210B-System Voltage High

For a complete wiring diagram, refer to.

• When Monitored: With the ignition on.

• Set Condition: The Auto High Beam Module detects the (F921) 5-volt Supply circuit voltage above 5.0 volts.






Test Step 1 - CHECK FOR ACTIVE DTC

• With the scan tool, read the active DTCs.

• Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds.

• With the scan tool, read the active DTCs.

Does the scan tool display this DTC as active?

Yes

• Go to Test Step 2

No

• If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Test Step 2 - (F921) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

• Turn the ignition off.

• Turn the ignition on.

• Measure the voltage of the (F921) 5-volt Supply circuit in the TIPM.

Is the voltage above 5.5 volts?

Yes

• Repair the (F921) 5-volt Supply circuit for a short to voltage.

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

No

• Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Junction Block in accordance with the service information.

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