DTC B272-C/D For The Dual Climate Control Seat Module (06-13-6)

Publication date: 2006-07-10
Reference number: 06-13-6
Supersedes refnos: 05-14-10

DTC B272-C/D FOR THE DUAL CLIMATE CONTROL SEAT MODULE

TECHNICAL SERVICE BULLETIN

Reference Number(s): 06-13-6, Date of Issue: July 10, 2006

FORD:	2005-2006 Expedition
LINCOLN:	2005-2006 Navigator

Superceded Bulletin(s): 05-14-10, Date of Issue: July 25, 2005

NOTE: This article supersedes TSB 05-14-10 to update the Service Procedure.

ISSUE

Some 2005-2006 Expedition and Navigator vehicles built prior to 03/26/2006 may exhibit concerns with the climate controlled seat (CCS) system with diagnostic trouble codes (DTCs) B272C (Driver Differential Temperature Fault) and/or DTC B272D (Passenger Differential Temperature Fault), with or without additional DTCs. These two DTCs may be triggered by various sources, making them difficult to diagnose.

ACTION

Refer to the following Service Procedure to isolate the cause of these DTCs. If DTC B272C and/or B272D are not present, follow normal Workshop Manual (WSM) diagnostics.

SERVICE PROCEDURE

SECTION 1

Depower the supplemental restraint system (SRS). Refer to WSM, Section 501-20B, General Procedures; Supplemental Restraint System Depowering and Repowering.
Check the connections along the CCS systems, passenger side: C3040, C3039, C3625a, C3625b; driver side: C3034, C3035, C311, C316, C3625b, C3625a. Ensure connectors are fully seated and secure. If the CCS is now operable, repower the SRS and return vehicle to the customer. If CCS system is still inoperable leave SRS depowered, continue to Step 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.
1. If the time to failure is 5 seconds or less then, proceed to Section 2.
2. If the time to failure is greater than 5 seconds but less than 40 seconds then, proceed to Section 3.
3. 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 (Seat Shuts Off In Less Than 5 Seconds)

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.
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.
1. If there is an over-temp DTC present then go to Step 3.
2. If no over-temp DTC is present then go to Step 6.
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?
1. If reading excessively hotter than room temperature, for example 200°F (93°C) or so, then go to Step 4.
2. If TED temperatures between Back TED and Cushion TED are 10° different, go to Step 11.
3. 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.
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) Fig 1 .)

Fig 1: Checking For Short To Ground Or Voltage In Thermistor Circuit
1. Check harness side of TED Connector (C3034 - driver back, C3035 - driver cushion, C3039 - passenger back, or C3040 - passenger cushion) for voltage with IGN on; is approximately 5v +/- 1.5v present at Pin 3. If voltage is present, proceed to Step 4b. If not, then unplug the dual climate control seat module (DCCSM) located under the passenger seat, and check if harness side Pin 3 is shorted to ground. If Pin 3 is shorted fix wiring, if not replace DCCSM.
2. Check TED assembly connector, is resistance across Pins 2 and 3 greater than 200 ohms?
  1. If no, then replace TED.
  2. If yes, go to Step 5.
If CCS continues to be inoperable with a B272C/D code and:
1. Time to failure is different than before, then start new diagnosis from Step 3 in Section 1.
2. Time to failure is not different than before, then go to Step 6.
3. If CCS is now operable, then repower the SRS and return vehicle to customer.
Are both ambient TED PID readings below 0°F (-18°C) or greater than 400°F (204°C)?
1. If yes, then the Connector C32656 on the DCCSM is not plugged in, or both TEDs (Driver- C3034 and C3035, Passenger - C3C39 and C3040) are not plugged in. Plug it in and proceed to Step 12.
2. If not then proceed to Step 7.
Is one of the TED PID readings below 0°F (-18°C) or greater than 400°F (204°C)?
1. If yes, then proceed to Step 8.
2. If no, then go to Step 9 in Section 3.
Verify the TED is plugged in. (C3034 - Driver Back, C3035 - Driver Cushion, C3039 - Passenger Back, or C3040 - Passenger Cushion)
1. If plugged in, then proceed to Step 9.
2. If not plugged in, then correct and proceed to Step 12.
Is the thermistor circuit in the TED open? (Check the connector (C3034 - Driver Back, C3035 - Driver Cushion, C3039 - Passenger Back, or C3040 - Passenger Cushion, C3265A - DCCSM). (Fig 2 )

Fig 2: Checking Thermistor Circuit In TED For Open
1. If it is open, then proceed to Step 10.
2. If it is not open, then proceed to Step 11.
Verify the wire harnesses to the thermistor are good (looking for shorts or opens in the harnesses).
1. If the wire harnesses to the thermistor are not good, then repair as needed and proceed to Step 12.
2. If the wire harnesses are good, then proceed to Step 11.
Is the resistance on the thermistor circuit at the TED Connector (C3034 - Driver Back, C3035 Driver Cushion, C3039 - Passenger Back, or C3040 - Passenger Cushion) (between 2.7 K ohms (proper value at 65°F) (18°C) to 1.86 K ohms (proper value at 80°F) (27°C) at ambient (room temperature)?
1. No, then replace the TED that is outside the resistance range specified above, assuming the TED is at room temperature, and proceed to Step 12.
2. Yes, then replace the DCCSM and proceed to Step 12.
If CCS continues to be inoperable with a B272C/D code, start a new diagnosis from Step 3 in Section 1, otherwise repower the SRS and finish other repairs as needed and return vehicle to customer.

SECTION 3 (Seat Shuts Off Less Than 40 Seconds, But More Than 5 Seconds)

Follow the spread terminal fix procedure listed in Section 5. If this has already been performed and in Step 3 in Section 1 has lead you back to this procedure, proceed to Step 2.
If CCS continues to be inoperable with a B272C/D code, determine if an over-temp DTC is present (B2729, B2730, B272A, B272B).
1. If there is an over-temp DTC present, then continue to Step 3.
2. If there is no over-temp DTC present, then continue to Step 5.
3. If CCS is now operable, then repower the SRS and return vehicle to customer.
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?
1. If readings are hotter than room temperature, go to Step 4.
2. If TED temperatures between Back and Cushion are 10° different, go to Step 12.
3. If reading correctly then, proceed to Step 5.
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). (Fig 1 )
1. 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.
2. 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. (Fig 2 )
Is one of the TED PID readings less than 0°F (-18°C) or greater than 400°F (204°C)?
1. If yes, go to Step 6.
2. If no, go to Step 7.
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.
1. 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.
2. If the correct voltage is present to the thermistor, then replace the TED assembly. Verify system now functions and return vehicle to customer.
Cycle ignition and enter into high cool mode. Does failure still occur?
1. If no, proceed to Step 8.
2. If yes, proceed to Step 13.
Ensure voltage is getting to the suspect TED. Enter heat mode and back probe Pin 6 of the TED connector.
NOTE: DO NOT LEAVE IN HEAT MODE FOR OVER 1 MINUTE.
1. If voltage is not getting to the suspect TED, proceed to Step 9.
2. If voltage is getting to the suspect TED, replace TED.
Ensure voltage is coming out of the module by back probing the suspect pin on C3265B of the module. (Fig 3 )

Fig 3: Dual Climate Control Seat Module Connector
- Driver Cushion - Pin 9
- Driver Backrest - Pin 8
- Passenger Cushion - Pin 11
- Passenger Backrest - Pin 22
1. If no voltage is coming out of the module, then replace the module and continue to Step 13.
2. If the correct voltage is coming out of the module, then continue to Step 10.
Disconnect DCCSM C3265B. Check for an open circuit (resistance greater than 5 ohms) from the TED that is reading the cold temperature to the CCSM (C3265B). If no open circuit is found, then continue to Step 11. (Fig 4 )

Fig 4: Checking For Open Circuit From TED
With DCCSM C3265B disconnected, check for a short circuit (short to voltage is less than 0.2 volts, short to ground is resistance less than 10,000 ohms) in the wiring from the TED that is not reading the over-temp to the CCSM. If no short circuit is found, then replace the TED. (Fig 5 )

Fig 5: Checking For Short Circuit In Wiring From TED
Is the resistance on the thermistor circuit at the TED connector (C3034 - driver back, C3035 Driver Cushion, C3039 - Passenger Back, or C3040 - Passenger Cushion) between 2.7 K ohms (proper value @ 65°F) (18°C) to 1.86 K ohms (proper value @ 80°F) (27°C) at ambient (room temperature)?
1. If no, then replace the TED that is outside the resistance range specified above, assuming the TED is at room temperature, and proceed to Step 12.
2. If yes, then proceed to Step 13.
If CCS continues to be inoperable with a B272C/D code and:
1. Time to failure is different than before, then start new diagnosis from Step 4 Section 1.
2. Time to failure is not different than before, then continue to Step 14.
3. If CCS is now operable, then repower the SRS and finish other repairs as needed and return vehicle to customer.
Check for any kinks or obstructions of the ducting from the fan to the TED. (Fig 6 and Fig 7 ).

Fig 6: Checking Ducting For Kinks Or Obstructions - Back Of Seat

Fig 7: Checking Ducting For Kinks Or Obstructions - Underside Of Seat
1. If there is a kink or obstruction of the ducting, repair as needed and continue to Step 15.
2. If there are no kinks or obstructions of the ducting then, continue to Step 16.
If CCS continues to be inoperable with a B272C/D code and:
1. Time to failure is different than before, then start new diagnosis from Step 3 in Section 1.
2. Time to failure is not different than before, then continue to Step 16.
3. If CCS is now operable, then repower the SRS and finish other repairs as needed and return vehicle to customer.
Check if the seat back/cushions are damaged or the scrim (Fig 8 and Fig 9 ) has been obstructed or damaged or bunched in the cushion blocking air flow from the TED.

Fig 8: Checking Seat Cushion Scrim

Fig 9: Checking Seat Back Scrim
1. If the cushion or scrim is damaged or bunched or is incorrect, then repair or replace the damaged cushion/scrim and continue to Step 17.
2. If the cushion or scrim is not damaged or bunched and is correct for a climate control seat, then replace the TED and continue to Step 17.
If CCS continues to be inoperable with DTC B272C/D code, start a new diagnosis from Step 3 in Section 1 of this TSB. If CCS in now operable, repower the SRS, and return vehicle to customer.

SECTION 4 (Seat Shuts Off After More Than 40 Seconds)

Check the temperature PIDS with a generic scan tool (GST) from the two TEDs on the affected seat when a heating cycle is initiated.
1. If a TED does not increase more than 1 or 2 degrees, then proceed to Step 2.
2. If the TEDs both increase temperature, then proceed to Step 3.
Let the TEDs sit with no heating or cooling cycle for 5 minutes. Check the resistance of the TED that does not increase temperature from Step 1.
1. If the resistance of the TED is around 2.5 ohms +/- 10 ohms at room temperature, then proceed to Step 3.
2. If the resistance of the TED is 0 or hundreds of ohms at room temperature then replace the TED, verify the fix and proceed to Step 6.
Check for any kinks or obstructions of the ducting from the fan to the TED.
1. If there are kinks, then replace the ducting, if there is an obstruction, then remove if possible otherwise replace the ducting and continue to Step 4.
2. If there are no kinks or obstructions of the ducting, then continue to Step 5.
If CCS continues to be inoperable with DTC B272C/D code and
1. Time to failure is different than before, then start new diagnosis from Step 3 in Section 1.
2. Time to failure is not different than before, then continue to Step 5.
3. If CCS is now operable, then repower the SRS and return vehicle to customer.
Check for seat back/cushions damage or if the scrim (Fig 8 and Fig 9 ) has been obstructed or damaged or bunched in the cushion blocking airflow from the TED, or the TED - CCS cushion alignment is incorrect.
1. If the cushion is not a CCS cushion, then replace it with a CCS cushion and proceed to Step 6.
2. If the TED and cushion alignment are incorrect, then correct the alignment, proceed to Step 6.
3. If the cushion or scrim is damaged or bunched or is incorrect, then repair or replace the damaged cushion/scrim and continue to Step 6.
4. If the cushion or scrim is not damaged or bunched and the cushion is a correct cushion for a climate control seat, then replace the TED and continue to Step 6.
If CCS continues to be inoperable with a B272C/D code, start a new diagnosis from Step 3 in Section 1 of this TSB; otherwise repower the SRS and return vehicle to customer.

SECTION 5 (Spread Terminal Fix Procedure)

Position the front passenger seat fully rearward and up.
Pull out and remove the seat track front cover.
Disconnect Connector C3265B 24-pin gray. (Fig 3 ).
Remove the red secondary wedge inside the connector.
Using an appropriate pick, or equivalent, disengage the internal lock that holds the terminals in cavities 8, 9, 10, 11, 21, 22, 23, 24 (Fig 3 ).
NOTE: DO NOT DISENGAGE MORE THAN ONE (1) CIRCUIT AT A TIME. ONLY DISENGAGE THE NEXT CIRCUIT AFTER THE PREVIOUS ONE HAS BEEN REPAIRED AND REASSEMBLED INTO THE CONNECTOR. THIS WILL PREVENT INSERTING CIRCUITS INTO THE WRONG CAVITY.
Insert the dental pick into the back part of each terminal (inside the box-shaped portion of the terminal) and bend the spring into the proper position (Fig 10 ).

Fig 10: Connector Spring
After all eight (8) terminals have been repaired, reinsert the red secondary wedge into the connector.
Reconnect C3265B to the dual climate control seat module.
Reinstall the seat track front cover.
Repower the SRS. Refer to WSM, Section 501-20B.
Verify the climate control seat function, and recheck DTCs.
If CCS continues to be inoperable with DTC B272C/D, start a new diagnosis from Step 3 in Section 1. If no DTCs are present, and system is operating correctly, repower the SRS, and return vehicle to customer. If system is still not operating properly, follow normal diagnostics per WSM.

PARTS INFORMATION

Part Number	Part Name
6L1Z-18D508-A	Thermal Elec. Device - Seat Back
2L1Z-18D508-AA	Thermal Elec. Device - Seat Cushion
2L1Z-78632A22-AA	Seat Cushion - Expedition
2L1Z-7864810-AB	Back Cushion - Expedition
2L7Z-78632A22-AA	Seat Cushion - Navigator
2L7Z-7864810-AB	Back Cushion - Navigator
5L1Z-14C724-BA	Control Module

WARRANTY INFORMATION

WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage.

WARRANTY INFORMATION

Operation	Description	Time
MT061306	Claim Labor As Actual Time	Actual Time

DEALER CODING

Basic Part No.	Condition Code
14C724	42