Pinpoint Test G: DTC B2268 Or DTC B2269 — Steering Wheel Auxiliary Control Switch Open Circuit Or Short To Ground
Refer to Wiring Diagrams Cell
55
, Automatic Climate Control System for schematic and connector information.
Normal Operation
Under normal operation, the steering wheel control switch receives a ground through circuit 57 (BK). The EATC module senses the resistance (depending on what button is pressed) from
the steering wheel control switch through circuit 1070 (BN/LB).
Possible Causes
An open in circuit 57 (BK) or circuit 1070 (BN/LB)
A short to ground or voltage in circuit 1070 (BN/LB)
Steering wheel control switch
Electronic automatic temperature control (EATC) module
PINPOINT TEST G: DTC B2268 OR DTC B2269 — STEERING WHEEL AUXILIARY CONTROL SWITCH OPEN CIRCUIT OR SHORT TO GROUND
NOTE:
For
DTC B1264
only.
Measure the resistance between HVAC module C228a-23, circuit 1376 (BK/LB),
harness side and floor door actuator C234-6, circuit 1376 (BK/LB), harness side.
Are the resistances less than 5 ohms?
F10 CHECK THE ACTUATOR CONNECTION
Disconnect the actuator connector.
Check for:
corrosion.
pushed-out terminals.
damaged terminals.
Connect and correctly seat the actuator connector.
Clear the DTCs.
Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new floor door actuator and panel/defrost door actuator. If a new actuator is
installed, CONNECT the actuator electrical connectors before the HVAC module
connectors. This will allow the new actuator to be calibrated when the HVAC module is
reconnected. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal
operation.
No
The system is operating correctly at this time. The concern may have been caused by a
loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.
F11 MODULE ACTUATOR POSITION CALIBRATION
NOTE:
The purpose of the module actuator position calibration is to allow the
HVAC module to reinitialize and calibrate the actuator stop points. To carry out
the calibration, follow the steps below.
Ignition OFF.
Inspect the module connectors for:
corrosion.
pushed-out terminals.
damaged terminals.
Connect and correctly seat all the HVAC module connectors.
Ignition ON.
Clear the DTCs.
Select any position except OFF.
NOTE:
The HVAC module will now initialize and calibrate the actuators.
Calibration of the actuators will take approximately 30 seconds.
Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new HVAC module. REFER to
Section 412-01
. TEST the system for normal
operation.
No
The system is now operating correctly at this time. The concern may have been caused
by a foreign object in the HVAC case or temporary binding that restricted actuator door
travel. CHECK any actuator external linkage. If condition recurs, INSPECT actuator
linkage and door for binding and CHECK HVAC case for foreign objects.
Test Step
Result / Action to Take
G1 CHECK THE INPUT TO THE EATC MODULE
Ignition OFF.
Disconnect: EATC Module C228b.
Measure the resistance between EATC module C228b-7, circuit 1070 (BN/LB) and ground.
Is the resistance reading between 4,500 and 5,000 ohms?
Yes
GO to
G2
.
No
If the resistance is less than 4,500 ohms, GO to
G3
. If the resistance is greater
than 5,000 ohms, GO to
G4
.
G2 CHECK THE STEERING WHEEL AUXILIARY CONTROL SWITCH OUTPUT
Measure the resistance between EATC module C228b-7, circuit 1070 (BN/LB) and ground.
Yes
GO to
G6
.
Page 25 of 45
2006 Town Car Workshop Manual
12/30/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS6G/~MUS~LEN/19/...
