headlight headlamp out on 2007 MKX

[James Patrick Golden]

New to the site and most definitely a neophyte when it comes to auto electronics.

 

After replacing the drivers side headlamp assembly 6 mos ago ($700), come out today to find the same lamp out. R) side still works. Seems that it is on a differnt fuse.

 

My local service guy thinks it may be the SJB. Dealer no longer carries the part so aftermarket then. ($450 parts and labor)

 

My question is: Can this be bypassed? pros/cons

 

Thanks in advance for any guidance you can provide.

 

JG

[WWWPerfA_ZN0W]

Welcome, JG! Is it just the low beam, just the high beam, or both lamps out? Checked for codes? Below is a sample of what the diagnostic involves:

 

Pinpoint Test B: One Low Beam Headlamp Is Inoperative

normal Operation

When the smart junction box (SJB) detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the LOW BEAM position, the SJB provides voltage through circuits CLF04 (BN/BU) and CLF05 (BU/GN) to the LH and RH low beam headlamps, respectively. Ground is supplied on circuit GD123 (BK/GY) for RH headlamp. Ground for the LH headlamp is routed through a joint connector through circuit GD120 (BK/GN).

 

DTC B2A2E Right Front Lamp Low Beam Circuit Open — is an on-demand DTC that sets when the SJB detects an open in the RH low beam output circuit.

DTC B2A2F Right Front Lamp Low Beam Circuit Short to Ground — is a continuous and on-demand DTC that sets when the SJB detects a short to ground in the RH low beam output circuit.

DTC B2A30 Left Front Lamp Low Beam Circuit Open — is an on-demand DTC that sets when the SJB detects an open in the LH low beam output circuit.

DTC B2A31 Left Front Lamp Low Beam Circuit Short to Ground — is a continuous and on-demand DTC that sets when the SJB detects a short to ground in the LH low beam output circuit.

• This pinpoint test is intended to diagnose the following:
• Fuse
• Wiring, terminals or connectors
• Joint connector
• Headlamp assembly (MKX)
• SJB

PINPOINT TEST B: ONE LOW BEAM HEADLAMP IS INOPERATIVE

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Due to varying wattage ratings and resulting current draw, certain aftermarket headlamp bulbs may cause the SJB to shut down the short circuit protection, resulting in the low beams becoming inoperative. Verify that the bulbs meet Ford specifications. If the bulbs do not meet Ford specifications, install the correct bulbs. Run the on-demand self-test (required to clear certain DTCs and reset the SJB). Correct any unresolved DTCs. Clear all DTCs. Test the system for normal operation.