Vehicle Stalls While Driving, No Start/Stalling – 2008-2011 Buick Lucerne & 2009-2011 Cadillac DTS

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15-NA-051

Service Procedure

1. Remove the rear seat bottom cushion (1).
2. Disconnect the negative battery cable.

3. Remove the REC cover (1).
4. Inspect the cover for signs of contact with the fuel pump relay.
5. Remove and inspect the fuel pump relay (3) for any signs of contact, damage and/or burn marks.
6. Remove and inspect the fuel pump fuse (2) for any signs of damage and/or burn marks.
7. Separate the upper REC (6) from the lower housing (4) by pressing the 4 locking tabs.
8. Inspect the REC for the following concerns:

• Contact marks from the seat brackets. (Lucerne Only)

• Burnt wires or terminals at the F1 cavity.

• Damaged and/or burnt X1 electrical connector.

9.  Remove the X1 connector from the REC.

10. Inspect the connector for any damaged or burnt terminals.

11. Inspect for any signs of warping or disfigurement caused by heat to the junction block (1).

If no damage is found, Do Not replace the fuse block and refer to SI for further diagnostics.

If damage was found, proceed with repair.

If no damage is found at the REC or the F1 cavity:

• Remove FPR relay (1) and discard.
• Install a low profile fuel pump relay (2).
• Trim seat brackets. (Lucerne Only)
• Re-position REC. (DTS Only)

If any damage is found at the REC and not at the F1 cavity:

• Replace the REC only.
• Trim seat brackets. (Lucerne Only)
• Re-position REC. (DTS Only)
  • If replacing the REC, it may have the taller fuel pump relay installed from the factory. The tall relay must be removed and replaced with a short relay.

If any damage is found at the REC and at F1 cavity:

• Replace the REC.
• Repair the wire terminal at the F1 cavity.
• If required, replace the X1 connector.
• Trim seat brackets. (Lucerne Only)
• Re-position REC. (DTS Only)
  • If replacing the REC, it may have the taller fuel pump relay installed from the factory. The tall relay must be removed and replaced with a short relay.

Rear Seat Bracket Repair for Lucerne

1. With the rear seat cushion on a bench, measure 5 mm (0.197 in) from each edge of the right side seat mount bracket and mark with a paint marker as shown (1).

2. Using a cut off wheel or equivalent, carefully cut each side of the bracket as shown (1). Check for any rough edges and file if necessary.
3. Install the rear seat cushion.
4. Connect the battery.

Rear Junction Block Positioning for DTS

1. Loosen the nuts that secure the REC to the floor panel.
2. Position the rear electrical center towards the rear of vehicle.
3. Tighten the nuts to specifications.
   • Refer to Fastener Specifications in SI.

Parts Information

Causal Part	Description	Part Number	Qty
x	Low Profile Fuel Pump Relay	88953222 Relay for Buick Lucerme, Chevrolet Caprice, Cobalt, Cadillac, Hummer H3, Pontiac G5, G8-88953222 Directly Replaces Failed OEM Part - Replacement for 88953222 Not Made In China - This product is manufactured in a Taiwan factory that prioritizes high quality standards and testing, fair worker salaries and safety, and environmental health standards. Taiwan produces many automotive OEM parts. Buy With Confidence - Return this product within 30 days of purchase if it does not fit or is faulty. Please double check compatibility with your original part and vehicle! $11.00 Buy on Amazon Price incl. tax, excl. shipping	1
	Rear Electrical Center	20777935 Genuine GM Block Part No. 20777935 $592.19 Buy on Amazon Price incl. tax, excl. shipping	1

Warranty Information

For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.

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