Hi, I have a Lexus 220D on 57 (UK September 2007 March 2008) plate. I can't open the boot!

Read the fault codes and repost, it is my guess the same codes are there again.

their are 7 recalls on the 07 none are for an electrical problem with lighting system
http://www.pontiacproblems.com/recalls/G5/2007 and the following tsb from march 2010 is for flickering lights

• TSB #PIC-5073B NHTSA ID #10034409
  • Date Announced: MARCH 01 2010
  • Additional Info: How to Fix
  Summary: CHEVROLET/PONTIAC: VARIOUS ELECTRICAL CONCERNS. SIR LIGHT, IP LIGHTS FLICKER/INOPERATIVE, PARKING LAMPS FLICKER/INOPERATIVE, TAIL LAMP DIM/INOPERATIVE, TRUNK OPEN LIGHT, RADIO INOPERATIVE DOOR LOCK INOPERATIVE, NO START, NO CRANK. POSSIB
  More Information »

ELECTRICAL SYSTEM:WIRING

• TSB #PI-0817 NHTSA ID #10047261
  • Date Announced: SEPTEMBER 01 2012
  • Additional Info: How to Fix
  Summary: CHEVROLET/PONTIAC/SATURN: ENGINE FAILS TO START AFTER ENGINE CRANKS DUE TO FUEL PUMP WIRE HARNESS CONNECTOR NEEDS REPLACING, WITHOUT REPLACING FUEL PUMP COVER ASSEMBLY (FUEL PUMP FLANGE). MODEL 2007-2010 COBALT, G5, ION. *PE
  More Information »
  

ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS

• TSB #PIC-4578 NHTSA ID #10022806
  • Date Announced: JUNE 01 2011
  • Additional Info: How to Fix
  Summary: EPS/STR WHEEL CONTROL FUSE (#19) OPEN. *KB UPDATED 10/04/07. *NJ UPDATED 8/7/09. *PE UPDATED 8/1/11. *PE
  
  More Information »
  
• TSB #PIC3385 NHTSA ID #10020916
  • Date Announced: FEBRUARY 01 2008
  • Additional Info: How to Fix
  Summary: REPEATED PARK LPS FUSE OPEN. *KB (ADDITIONAL INFORMATION) UPDATED 4/1/08. *NJ
  

2007 Pontiac G5 Recalls CarComplaints com

Pull the cluster out and then remopve the screws that attach the lens to the instrument panel body.

No fuse for this. If the doors work and not the boot. It is wiring or the latch motor.

It's now a recall item. See below.


NHTSA CAMPAIGN ID Number: 15V415000
Component: STRUCTURE:BODY:HATCHBACK/LIFTGATE
Manufacturer: General Motors LLC
Potential Number of Units Affected: 686287

Year: 2009
Make: Chevrolet
Model: Traverse
Manufactured
from: 2008-07-06
to: 2012-02-29
Recall Date: 2015-06-30
-->
Summary:

General Motors LLC (GM) is recalling certain model year 2008-2012 Buick Enclave vehicles manufactured January 3, 2007, to February 29, 2012, 2009-2012 Chevrolet Traverse vehicles manufactured July 6, 2008, to February 29, 2012, 2007-2012 GMC Acadia vehicles manufactured September 15, 2006, to February 29, 2012, and 2007-2010 Saturn Outlook vehicles manufactured August 17, 2006, to March 18, 2010. The affected vehicles, equipped with the power liftgate option, have gas struts that hold the power liftgate up when open. These struts may prematurely wear and the open liftgate may suddenly fall.

If the open liftgate unexpectedly falls, it may strike a person, increasing their risk of injury.

GM will notify owners, and dealers will update the software for the power liftgate actuator motor control unit so that the motor will prevent the rapid closing of the lift gate, free of charge. Owners were mailed interim notices on August 3, 2015. Owners will receive a second notice when remedy parts become available. Owners may contact Buick customer service at 1-800-521-7300, Chevrolet customer service at 1-800-222-1020, GMC customer service at 1-800-462-8782, and Saturn customer service at 1-800-553-6000. GM's number for this recall is 15240.

It is Both headlights? Or just one side.If if is just one side its possible its the fuse.

First of all, supposedly there is a little emergency release behind a flap of carpet in the boot behind the gas cap. On the other hand, you should probably check all your fuses for a more permanent solution.