One or Both Wipers Running Continuously

TASK 30-45-00-810-811-A
One or Both Wipers Running Continuously

CAUTION: DO NOT OPERATE THE WIPERS WHEN THE WINDSHIELD IS DRY. PUT WATER ON THE WINDSHIELD WHEN THE WIPERS OPERATE.

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 30-45-00-720-001	Functional Test of the Windshield Rain Protection
ASM 304501
AMM 30-45-51-000-001	Removal of the Wiper Motor Converter
AMM 30-45-51-400-001	Installation of the Wiper Motor Converter

3. Fault Confirmation
Subtask 30-45-00-720-068-A

A. Test
Do the functional test of the windshield rain protection AMM 30-45-00-720-001.

4. Fault Isolation
Subtask 30-45-00-865-058-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	ANTI ICE/F/O/WIPER	4DB2	W12
122VU	ANTI ICE/WIPER/CAPT	4DB1	X12

Subtask 30-45-00-810-060-A

B. If the test confirms the fault:

Do a check of the status of the ANTI ICE/WIPER/CAPT (4DB1) (ANTI ICE/F/O/WIPER (4DB2)) circuit breaker.

(1) If the ANTI ICE/WIPER/CAPT (4DB1) (ANTI ICE/F/O/WIPER (4DB2)) circuit breaker is closed:

Do a check for 28VDC at pin A of the MOTOR CONVERTER-WIPER, CAPT (6DB1) (MOTOR CONVERTER-WIPER, F/O (6DB2)) ASM 304501.

(a) If there is no 28VDC:

Repair the wiring from pin 2 of the ANTI ICE/WIPER/CAPT (4DB1) (ANTI ICE/F/O/WIPER (4DB2)) circuit breaker to pin A of the MOTOR CONVERTER-WIPER, CAPT (6DB1) (MOTOR CONVERTER-WIPER, F/O (6DB2)).

(b) If there is 28VDC:
1 On the OVERHEAD CTL & IND panel 21VU (22VU), set the WIPER control switch to SLOW.

Do a check for ground at pin C of the MOTOR CONVERTER-WIPER, CAPT (6DB1) (MOTOR CONVERTER-WIPER, F/O (6DB2)).

a If there is no ground signal:

Do a check of the wiring from pin C of the MOTOR CONVERTER-WIPER, CAPT (6DB1) (MOTOR CONVERTER-WIPER, F/O (6DB2)) to pin 3 of the WIPER control switch, CAPT (5DB1) (WIPER control switch, F/O (5DB2)).

If there is no continuity:
Repair the above wiring .

If there is continuity:
Replace the CTL SW-WIPER, CAPT [5DB1] ( CTL SW-WIPER, F/O [5DB2] )

b If there is a ground signal:

2 On the OVERHEAD CTL & IND panel 21VU (22VU), set the WIPER control switch to FAST.

Do a check for ground at pin E of the MOTOR CONVERTER-WIPER, CAPT (6DB1) (MOTOR CONVERTER-WIPER (6DB2)).

a If there is no ground signal:

Do a check of the wiring from pin E of the MOTOR CONVERTER-WIPER, CAPT (6DB1)(MOTOR CONVERTER-WIPER, F/O (6DB2)) to pin 4 of the WIPER control switch, CAPT (5DB1) (WIPER control switch, F/O (5DB2)).

If there is no continuity:
Repair the above wiring .

If there is continuity:
Replace the CTL SW-WIPER, CAPT [5DB1] ( CTL SW-WIPER, F/O [5DB2] ).

b If there is a ground signal:

Replace the MOTOR CONVERTER-WIPER, CAPT [6DB1] ( MOTOR CONVERTER-WIPER, F/O [6DB2] ) AMM 30-45-51-000-001 and AMM 30-45-51-400-001.

(2) If the ANTI ICE/WIPER/CAPT (4DB1) (ANTI ICE/F/O/WIPER (4DB2)) circuit breaker is open:

(a) If the fault continues:

(3) If the fault continues:

Replace the MOTOR CONVERTER-WIPER, CAPT [6DB1] ( MOTOR CONVERTER-WIPER, F/O [6DB2] ) AMM 30-45-51-000-001 and AMM 30-45-51-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:29:45 UTC