Expedition 4WD V8-5.4L SOHC VIN 5 (2005)
Seat Heater: Customer Interest
A/C - Front Seat Heaters Inoperative
TSB 07-16-8
08/20/07
CLIMATE CONTROL SEAT HEAT FUNCTION
INOPERATIVE - VEHICLES BUILT PRIOR TO 3/24/2005
FORD:
2005 Expedition
LINCOLN:
2005 Navigator
This article supersedes TSB 06-6-8 to update the Service Procedure.
ISSUE
Some 2005 Expedition/Navigator vehicles built before 3/24/2005 and equipped with climate control seats may exhibit inoperative heating on one or both
seats. There are no diagnostic trouble codes (DTCs) associated with this issue and the cooling function will operate normally.
ACTION
It may be necessary to replace the dual climate control seat module (DCCSM), or re-seat the connectors. Refer to the following Service Procedure.
SERVICE PROCEDURE
NOTE
THE FOLLOWING STEPS MUST BE PERFORMED IN ORDER TO AID IN DIAGNOSIS.
1.
Turn the ignition switch to key on engine off (KOEO) position.
2.
Run self test on DCCSM.
a.
If DTCs are present do not continue with this TSB, follow normal Workshop Manual diagnostics for the DTCs.
b.
If no DTCs are present proceed to Step 3.
3.
Start engine.
4.
Activate driver and passenger seat heat mode. Set for high heat (three (3) LEDs should be on). Let the system remain activated for at least 3
minutes.
NOTE
THE HEATED SEATS WILL TURN OFF AFTER FIFTEEN (15) MINUTES.
5.
Monitor PIDs (9956 driver cushion, 9957 driver seat back, 9121 passenger cushion, and 9122 passenger seat back) to verify whether or not the
seat(s) temperature increases. Also monitor PIDs (9955 driver blower RPM and 9120 passenger blower RPM), to verify that the seat fan RPMs are
greater then zero.
a.
If the three (3) LEDs remain ON, the fan remains ON, and there is no heat in one or both seats, remove Fuse 2.118 and wait at least 2
minutes. This will reset the DCCSM. Reinstall the fuse and recheck operation of the heated seat. If the concern is resolved by resetting,
replace the DCCSM. Refer to Section 501-10 of the Workshop Manual. If concern is not resolved proceed to Step 5b.
b.
Check both connectors at the DCCSM for loose or improperly seated connection. Disconnect the connectors at the module, verify there are
no pin push outs or terminal concerns, then reconnect. Recheck operation of the heated seat. If concern is resolved, return the vehicle to the
customer. If not, proceed with normal Workshop Manual, Section 501-10 diagnostics.
Parts Block
