Captiva |
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• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Headlamp Main Beam Relay Control | B2580 00 | B2580 00 | B2580 00 | -- |
Voltage is applied at all times to the main beam headlamp relay from battery voltage. When the multifunction switch is placed in either the FTP or HIGH position, ground is applied to the body control module (BCM). The BCM then applies a ground to the headlamp main beam relay control circuit. This engages the relay and applies voltage through the HI HEADLAMP fuses to both left and right main beam headlamps.
The ignition is ON. The main beam headlamps must be commanded ON by the multifunction switch.
The BCM detects a short to ground, open, high resistance, or short to voltage on the headlamp main beam relay control circuit.
The main beam headlamps are inoperative.
• | The conditions for setting the DTC are no longer present. |
• | A history DTC clears after 100 malfunction-free ignition cycles. |
• | The BCM receives the clear code command from the scan tool. |
Headlamps/Daytime Running Lamps (DRL) Schematics
Control Module References for scan tool information
Ignition ON, activate the Main beam output control on the scan tool. The Main beam Relay Command parameter in the data list should display On and the main beam headlamps should illuminate.
⇒ | If a ground signal is present, replace the underbonnet fuse block. If a ground signal is not present, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
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