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Q5/X451 FATC
DTC Troubleshooting Data
Version: 1.0
Date: 16-Oct-2018
Copyright ©
TATA MOTORS Ltd.
This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author.
Author: ERC
Page: 125 of 202
B1F37-23:- Max. Defrost Request Button-Signal Stuck Low
Overview:-
ISO Code
B1F37– 23
Customer Symptom
Max. Defrost Request Button cannot be manually
selected
Fault Effects (On Vehicle)
Max. Defrost Request switch is stuck and air
distribution mode is not changing to defrost mode
Lamp Status (If Any)
If panel was in Max Defrost state prior to Key jam
detection, then the panel will continue to remain in
Max defrost state until any user interventions. To
change the air-distribution settings, user can press the
manual mode setting button.
If Key Jam(Stuck) is cleared, Max Defrost will be
activated with single Max Defrost key press.
Fault Detection Condition
Max. Defrost Request Button -Signal Stuck Low
Normal Operating Condition
Max Front Defrost Request push button shall be used
to manually switch the air distribution to defrost
mode and clearing/defogging the front windshield
Probable Trouble Area
Max defrost switch component failure.
Healing Condition
Check and lubricate switch, replace control panel
Component Details:
Max Front Defrost
switch Button is shown in above image.
Max Front Defrost Request push button shall be used
to manually switch the air distribution to defrost mode
Preliminary Checks:
Switch On the IGN & perform the following check.
1) Connect the Diagnostics tool & check the DTC fault code
2) If the fault code exists, refer the corrective actions