Expedition 4WD V8-5.4L VIN 5 (2006)
c.
If CCS is now operable, then repower the SRS and return vehicle to customer.
3.
Are any of the Temperature PIDS reading between 200° F (93° C) and 400° F (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 readings are hotter than room temperature, go to Step 4.
b.
If TED temperatures between Back and Cushion are 100 different, go to Step 12.
c.
If reading correctly then, proceed to Step 5.
4.
Check for short to ground or voltage in the thermistor circuit. (As shown on TED connector (C3034 - Driver Back, C3035 - Driver Cushion,
C3039 - Passenger Back, or C3040 - Passenger Cushion). (Figure 1)
a.
Looking into the harness side of the TED connector (C3034 - Driver Back, C3035 - Driver Cushion, C3039 - Passenger Back, or C3040 -
Passenger Cushion) the voltage should read 5v +/- 1.5v present at Pin 3 with the ignition on.
(1)
If no, then unplug DCCSM and check if harness side Pin 3 is shorted to ground.
(2)
If yes, fix the wiring, if no replace the DCCSM.
b.
Checking TED assembly connector, is resistance across Pins 2 and 3 greater than 1000 ohms?
(1)
If yes, go to Step 5.
(2)
If no, then replace TED. (Figure 2)
5.
Is one of the TED PID readings less than 0° F (-18° C) or greater than 400° F (204° C)?
a.
If yes, go to Step 6.
b.
If no, go to Step 7.
6.
Ensure the module is producing voltage to the thermistor circuit of the TED, checking the harness side of TED connector (C3034 - Driver Back,
C3035 - Driver Cushion, C3039 - Passenger Back, or C3040 - Passenger Cushion) the voltage should be 5v +/- 1.5v present at Pin 3 with ref to
Pin 2.
a.
If no voltage to thermistor is present at TED, then ensure the harness is not damaged by checking the voltage at the module Connector
C3265A-Pins 13, 14, 15, 16 (DCCSM Connector C3265B must remain plugged in). If no voltage is present at DCCSM, then replace
DCCSM, otherwise replace the harness. Verify system now functions and return vehicle to customer.
b.
If the correct voltage is present to the thermistor, then replace the TED assembly. Verify system now functions and return vehicle to
customer.
7.
Cycle ignition and enter into high cool mode. Does failure still occur?
a.
If no, proceed to Step 8.
b.
If yes, proceed to Step 13.
