Pinpoint Test A : One Or Both Upper Low Beams Is Inoperative - Vehicles With Halogen Headlamps
One Or Both Upper Low Beams Is Inoperative - Vehicles With Halogen Headlamps
Refer to Headlamps/Autolamps for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - Overview .
REFER to: Exterior Lighting - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1D00:11 | Left Low Beam: Circuit Short To Ground | A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LH low beam output circuit. |
| B1D00:15 | Left Low Beam: Circuit Short To Battery Or Open | A continuous memory and on-demand DTC that sets when the BCM detects an open from the LH low beam output circuit. |
| B1D01:11 | Right Low Beam: Circuit Short To Ground | A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the RH low beam output circuit. |
| B1D01:15 | Right Low Beam: Circuit Short To Battery Or Open | A continuous memory and on-demand DTC that sets when the BCM detects an open from the RH low beam output circuit. |
| U1000:00 | Solid State Driver Protection Active -Driver Disabled: No Sub Type Information | This DTC sets when the BCM has temporarily shut down the output driver. The module has temporarily disabled an output because an excessive current draw exists (such as a short to ground). The BCM cannot enable the output until the cause of the short is corrected, the Diagnostic Trouble Codes (DTCs) have been cleared and a successful self-test is run. For additional information on BCM Field Effect Transistor (FET) protection, REFER to: Body Control Module (BCM) - System Operation and Component Description . |
| U3000:49 | Control Module: Internal Electronic Failure | This DTC sets when the BCM has permanently shut down the output driver. The module has permanently disabled an output because an excessive current draw fault (such as a short to ground) has exceeded the limits that the BCM can withstand. CORRECT the cause of the excessive current draw before installing a new BCM. For additional information on BCM Field Effect Transistor (FET) protection, REFER to: Body Control Module (BCM) - System Operation and Component Description . |
Possible Sources
- Wiring, terminals or connectors
- Bulb
- BCM
Visual Inspection and Diagnostic Pre-checks
- Inspect the headlamp assembly for damage.
- A1 DETERMINE IF ONE OR BOTH LOW BEAMS ARE INOPERATIVE
- Ignition ON.
- Place the headlamp switch in the HEADLAMPS position.
Are both low beams inoperative?
Yes GO to A7 No GO to A2 - A2 CHECK FOR VOLTAGE FROM THE HEADLAMP LOW BEAM CIRCUIT
- Place the headlamp switch in the OFF position.
- Ignition OFF.
- Disconnect: Inoperative LH Upper Headlamp C1509A or RH Upper Headlamp C1510A.
- Ignition ON.
- Place the headlamp switch in the HEADLAMPS position.
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1509A-1 Ground RH Headlamp
Positive Lead Measurement / Action Negative Lead C1510A-1 Ground
Is the voltage greater than 11 volts?
Yes GO to A6 No GO to A3 - A3 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE HEADLAMP LOW BEAM CIRCUIT
- Place the headlamp switch in the OFF position.
- Using a diagnostic scan tool, perform the BCM self-test.
- Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver).
- Ignition OFF.
- Ignition ON.
- Place the headlamp switch in the HEADLAMPS position.
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1509A-1 Ground RH Headlamp
Positive Lead Measurement / Action Negative Lead C1510A-1 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new low beam headlamp bulb. REFER to: Headlamp Bulb . No GO to A4 - A4 CHECK THE LOW BEAM CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Place the headlamp switch in the OFF position.
- Disconnect: BCM C2280G.
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1509A-1 Ground RH Headlamp
Positive Lead Measurement / Action Negative Lead C1510A-1 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to A5 No REPAIR the circuit. After the repair: If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation. If any BCM Diagnostic Trouble Codes (DTCs) other than DTC U3000:49 are present, CLEAR the Diagnostic Trouble Codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. TEST the system for normal operation. If DTC U3000:49 is present, Refer to BCM Guided Routine . - A5 CHECK THE LOW BEAM CIRCUIT FOR AN OPEN
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1509A-1 C2280G-4 RH Headlamp
Positive Lead Measurement / Action Negative Lead C1510A-1 C2280G-2
Is the resistance less than 3 ohms?
Yes GO to A7 No REPAIR the circuit. - Measure:
- A6 CHECK THE HEADLAMP GROUND CIRCUIT FOR AN OPEN
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1509A-1 C1509A-2 RH Headlamp
Positive Lead Measurement / Action Negative Lead C1510A-1 C1510A-2
Is the voltage greater than 11 volts?
Yes INSTALL a new low beam headlamp bulb. REFER to: Headlamp Bulb . No REPAIR the circuit in question. - Measure:
- A7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, Refer to BCM Guided Routine . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.