Service Procedure
Service ProcedureBuick Lucerne and Cadillac DTS Vehicles (non Limo/Hearse/Armored Vehicles)
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
2. Open the hood of the vehicle.
3. Locate the underhood electrical center.
4. Disengage the electrical center cover lock tabs and remove the cover.
5. Examine the starter/alternator cables (2) and engine wire harness (3) at the power steering line and power steering bracket (1) location.
- If the cables are twisted or touching the power steering line or power steering line bracket, proceed to Step 6.
- If the starter/alternator cables and engine wire harness are NOT twisted or touching the power steering line or power steering line bracket, proceed to Step 13.
6. Remove the fastener securing the starter/alternator cables.
7. Remove the starter/alternator cables from the underhood electrical center stud.
Note
The (A) portion of the illustration shows the line touching the power steering line. The (B) portion of the illustration shows the engine wire harness tucked below and away from the power steering line and power steering line bracket.
8. Push the engine wire harness (1) below and away from the power steering line and power steering line bracket (2).
9. Untwist and re-route the starter/alternator cables and engine wire harness. Ensure that the starter cable is on top at the UBEC.
10. Install the starter/alternator cables to the underhood electrical center stud.
11. Ensure that the starter/alternator cables and engine wire harness do NOT contact the power steering return line or bracket. The starter/alternator cables must also be routed forward of the engine wire harness.
12. Tighten the stud fastener to 15 Nm (11 lb ft).
13. Secure the starter/alternator cables and engine wire harness with a tie strap (1), P/N 11509087, at the power steering line location (2). Ensure that the cables are NOT touching the power steering line or power steering line bracket.
14. Cut excess tie strap.
15. Push the head of the tie strap down.
16. Install the underhood electrical cover.
17. Close the hood of the vehicle.
18. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
Coach Builder Limousine and Coach Builder Limousine Armored Vehicles
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
2. Open the hood of the vehicle.
3. Remove the front compartment sight shield. Refer to Front Compartment Sight Shield Replacement in SI.
4. Locate the underhood electrical center.
5. Disengage the electrical center cover lock tabs and remove the cover.
6. Recover the A/C refrigerant. Refer to Refrigerant Recovery and Recharging in SI.
7. Remove the fastener securing the starter and alternator cables.
8. Remove the starter and alternator cables and positive battery cable from the underhood electrical center stud.
9. Remove the underhood electrical center from the vehicle. Refer to Underhood Electrical Center or Junction Block Replacement in SI.
10. Identify the air conditioning evaporator hose (2) and the engine wire harness (1).
11. Disconnect the air conditioning evaporator hose.
Note
The starter and alternator cables are secured with two tie straps. Refer to the illustration for the location of the two tie straps (1). The lower tie strap is located near the radiator hose.
12. Cut the lower tie strap (1) that secures the starter and alternator cables.
13. Route engine wire harness (1) under the air conditioning evaporator hose (2).
14. Re-connect the air conditioning evaporator hose (2).
15. Install the underhood electrical center (3) into the vehicle. Refer to Underhood Electrical Center or Junction Block Replacement in SI.
Note
The starter and alternator cables are secured with two tie straps. Refer to the illustration for the location of the two tie straps (1). The lower tie strap is located near the radiator hose.
16. Install a new lower tie strap (1), P/N 11509087, onto the starter and alternator cables.
17. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging in SI.
18. Install the starter and alternator cables and positive battery cable to the underhood electrical center stud.
19. Ensure that the starter/alternator cables and engine wire harness do NOT contact the power steering return line or power steering line bracket (1).
20. Tighten the stud fastener to 15 Nm (11 lb ft).
21. Install the underhood electrical center cover.
22. Install the front compartment sight shield. Refer to Front Compartment Sight Shield Replacement in SI.
23. Close the hood of the vehicle.
24. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
Coach Builder Hearse Vehicles
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
2. Open the hood of the vehicle.
3. Remove the front compartment sight shield. Refer to Front Compartment Sight Shield Replacement in SI.
4. Locate the underhood electrical center.
5. Disengage the electrical center cover lock tabs and remove the cover.
6. Remove the fastener securing the starter and alternator cables.
7. Remove the starter and alternator cables and positive battery cable from the underhood electrical center stud.
8. Determine if the engine wire harness (1) has been routed between the starter and alternator cables (2).
- If the engine wire harness (1) is routed between the starter and alternator cables (2), proceed to Step 9.
- If the engine wire harness (1) is NOT routed between the starter and alternator cables (2), proceed to Step 10.
9. Remove the underhood electrical center from the vehicle. Refer to Underhood Electrical Center or Junction Block Replacement in SI.
10. Route the engine wire harness (2) and starter and alternator cables (3) over the air conditioning evaporator hose (1) and BELOW the power steering line and bracket (4). Ensure that the engine wire harness (2) and starter and alternator cables (3) do NOT contact the power steering line or power steering line bracket (4).
11. Secure the engine wire harness and starter and alternator cables with a tie strap, P/N 11509087, and tuck the lines under the upper radiator hose.
Note
Performing Step 12 is NOT required if the underhood electrical center was not removed in Step 9.
12. Install the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement in SI.
13. Install the starter and alternator cables and positive battery cable from the underhood electrical center stud.
14. Install the fastener securing the starter and alternator cables.
15. Install the underhood electrical center cover.
16. Install the front compartment sight shield. Refer to Front Compartment Sight Shield Replacement in SI.
17. Close the hood of the vehicle.
18. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.