Why does the 2007 Volvo Xcode headlamp turn off when the ignition turns on

There are two types or timing, camshaft and ignition.. Let's assume Camshaft and Valve timing

The headlamps may be turned ON in 2 different ways. First, when the driver places the headlamp switch in the HEADLAMP position, for normal operation. Second, with the headlamp switch placed in the AUTO position, for automatic lamp control (ALC). During ALC the headlamps will be in DRL operation in daylight conditions, or headlamp operation in low light conditions.
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.

Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.


Do you know how to test electrical circuit's - relay's ? How to use a digital voltmeter ?

Do you know anything about automotive electronics ? Electronic control modules .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a GMLAN serial data message from the BCM that the high beams are illuminated.
High Beams
The high beam headlamps receive voltage from the headlamp high relay located in the underhood fuse block. The BCM controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block.
Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.

Hooking up a factory scan tool an checking DTC'S - diagnostic trouble codes would be the very first step in trouble shooting this problem .
DTC B257A 00: Headlamp Switch Input Signal Mismatch
DTC 2575 00: Headlamp Control Circuit

Replace fuse. If fuse blows again it could be the ballasts have gone bad .

HEADLAMP (FOR USA)
LT-21
C
D
E
F
G
H
I
J
L
M
A
B
LT
Revision: December 2006
2007 Sentra
8.
CHECK HEADLAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector (A) and
headlamp harness connector (B).
OK or NG
OK >> Replace IPDM E/R. Refer to
PG-30, "
Removal and
Installation of IPDM E/R
"
.
NG >> Repair harness or connector.
Headlamp Low Beam Does Not Illuminate (One Side)
EKS00JMQ
1.
HEADLAMP LOW BEAM FUSE INSPECTION
Inspect 15A fuse [No. 40 (LH) and No. 41 (RH) located in IPDM E/R].
OK or NG
OK >> GO TO 2.
NG >> Repair harness

What year ,make an model vehicle ? No electricity at the ignition switch when you try to start the engine ? Trying to understand here what's happening ! Can you turn the Headlamps on an are they bright ? Just nothing happens when you turn the key to the start position ! Is this what's happening ? If so could have a bad relay , park neutral safety switch , wiring issue etc. Now on the other side of thing's if the headlamps do not turn on bright you could have battery cable problems or connection issues !

Your ignition needs replaced. They weren't the best on Volvos; especially if there is a lot of weight on your keychain.

I just had this problem w/ a 2007 xc70 try this: http://www.volvoxc.com/forums/showthread.php?16222-Step-by-step-to-temporarily-mobilize-a-paralyzed-quot-stuck-key-quot-broken-switch-condition&highlight=ignition%20lock

SECTION 417-01: Exterior Lighting 2007 Expedition/Navigator Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 08/10/2006 Headlamp Bulb Printable View (255 KB) Expedition Headlamp
Item Part Number Description 1 13006/13005 Headlamp assembly (LH/RH) 2 13N021 Headlamp bulb

Navigator High Intensity Discharge (HID) Headlamp Bulb
Item Part Number Description 1 13N019 HID bulb access cover 2 — HID bulb screws (2 required) (part of 13A006) 3 13N021 HID bulb 4 13A006 HID bulb electrical connector and harness Removal and Installation
WARNING: The headlamp bulb contains gas under pressure. The bulb may shatter if the glass envelope is scratched or if the bulb is dropped. Handle the bulb only by its base. Avoid touching the glass envelope. Failure to follow these instructions may result in personal injury.
NOTE: The headlamp bulb should not be removed from the headlamp until just before a new bulb is installed. Removing the bulb for an extended period of time may affect headlamp bulb performance. Contaminants may enter the headlamp where they can settle on the lens and reflector. Never turn on the headlamp with the bulb removed from the headlamp.
NOTE: Make sure that the headlamp switch and the ignition switch are in the OFF position.
All vehicles

1. Remove the headlamp assembly. For additional information, refer to Headlamp Assembly in this section.

Expedition

1. Rotate the headlamp bulb approximately 1/8 turn counterclockwise and remove the bulb from the headlamp assembly.

Navigator

1. Remove the HID bulb access cover.

1. Remove the 2 screws and the HID bulb.
   • Disconnect the electrical connector.

All vehicles

1. To install, reverse the removal procedure.

maybe the new bulb was no good