Expedition 4WD V8-5.4L VIN 5 (2006)
3.
If CCS continues to be inoperable with a DTC of B272C/D code then note the time until the CCS fails when activated in the heat mode.
a.
If the time to failure is 5 seconds or less then, proceed to Section 2.
b.
If the time to failure is greater than 5 seconds but less than 40 seconds then, proceed to Section 3.
c.
If the time to failure is 40 seconds or greater, then, proceed to Section 4.
NOTE
THERE ARE 4 PIDS WHEN USING IDS THAT READ THE TEMPERATURE OF THE 4 THERMO-ELECTRIC DEVICES (TEDS) IN THE
VEHICLE. WHEN ASKED TO MONITOR THE PIDS, THIS TSB IS REFERRING TO THE PID'S OF THE AFFECTED SEAT BEING
DIAGNOSED.
THE PIDS ARE AS FOLLOWS: (CSHTEMP) DRIVER CUSHION, (BK_TEMP) DRIVER SEAT BACK, (PCSHTMP) PASSENGER CUSHION,
(PBK_TEMP) PASSENGER SEAT BACK.
Section 2
SECTION 2 (Seat Shuts Off In Less Than 5 Seconds)
1.
Follow the spread terminal fix procedure listed in Section 5. If this has already been performed and Step 3 in Section 1 has lead you back to this
procedure, proceed to Step 2.
2.
If CCS is inoperable with a DTC B272C/D code, determine if an over-temp DTC is present (B2729, B2730, B272A, B272B) only on the first
heating cycle. If the over-temp code is present after several heating cycles then allow the TED's to rest for 15 minutes before retesting the system.
a.
If there is an over-temp DTC present then go to Step 3.
b.
If no over-temp DTC is present then go to Step 6.
3.
Are any of the TED PIDS reading between 200-400° F (93-204° C) at room temperature conditions (when heat mode has not been on for 5
minutes), or is one TED reading 10° higher than the other TED?
a.
If reading excessively hotter than room temperature, for example 200° F (93° C) or so, then go to Step 4.
b.
If TED temperatures between Back TED and Cushion TED are 10° different, go to Step 11.
c.
If readings are correct, then check for blockage / obstruction of the cushion or the ducting. If blockage is not found, then replace the module
and proceed to Step 5. If blockage is found, repair as needed.
