Loss of the Windshield Heating System

TASK 30-42-00-810-803-A
Loss of the Windshield Heating System

1. Possible Causes

WINDSHIELD-L [3DG1]
WHC-1 [2DG1]
wiring from the WHC 1 (2DG1) to L windshield (3DG1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 30-42-00-710-001	Operational Test of the Windshield Anti-Icing and Defogging
ASM 304201
AMM 30-42-34-000-001	Removal of the Window Heat Computer (WHC)
AMM 30-42-34-400-001	Installation of the Window Heat Computer (WHC)
AMM 56-11-11-000-001	Removal of the Windshield
AMM 56-11-11-400-001	Installation of the Windshield
L Windshield Electrical Connector
Heating Coat Resistance Versus Temperaure - Fixed Window Film

3. Fault Confirmation
Subtask 30-42-00-710-054-A

A. Test
(1) Do the operational test of the windshield anti-icing and defogging AMM 30-42-00-710-001.

4. Fault Isolation
Subtask 30-42-00-810-052-A

A. If the test gives maintenance message L WINDSHIELD:

Disconnect the electrical connector from the L windshield (3DG1) and do a check of the resistance between pin A and pin B on the receptacle of the L windshield (3DG1).
L Windshield Electrical Connector
Heating Coat Resistance Versus Temperaure - Fixed Window Film

(1) If the resistance is more than 14 ohms or less than 10 ohms:

Replace WINDSHIELD-L [3DG1] , AMM 56-11-11-000-001 and AMM 56-11-11-400-001.

(2) If the resistance is between 10 ohms and 14 ohms:
(a) Replace WHC-1 [2DG1] , AMM 30-42-34-000-001 and AMM 30-42-34-400-001.
(b) If the fault continues:

Do a check and repair the wiring from the WHC 1 (2DG1) to L windshield (3DG1) pin A/C and pin A/D to pin A/A and pin A/B ASM 304201.

Subtask 30-42-00-710-055-A

B. Do the operational test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:40 UTC