YES
NO

1 PRESS THE WINDOW ANTI-ICE
11 MEASURE THE RESISTANCE OF
SWITCH TO OFF. DISCONNECT THE THE SPARE SENSOR.
SENSOR FROM THE WINDOW HEAT IS THE RESISTANCE MORE
CONTROL UNIT. MEASURE THE THAN APPROXIMATELY 358 OHMS?
RESISTANCE OF THE SENSOR.

YES
IS THE RESISTANCE MORE THAN APPROXIMATELY 358 OHMS?

NO NO

2 OPEN THESE CIRCUIT
BREAKERS:

C394 WINDOW ANTI-ICE RIGHT FRONT C393 WINDOW ANTI-ICE RIGHT SIDE C228 WINDOW ANTI-ICE LEFT FRONT C392 WINDOW ANTI-ICE LEFT SIDE.
REPLACE THE WINDOW HEAT CONTROL UNIT WITH THE WINDOW HEAT CONTROL UNIT FOR THE ADJACENT WINDOW. CLOSE THECIRCUIT BREAKERS ABOVE. PRESS THE WINDOW ANTI-ICE SWITCH TO ON.
DOES THE OVERHEAT LIGHT GO OFF?
YES
23 REPLACE THE P5-9 MODULE (AMM 30-09-11/401). IF THE OVERHEAT LIGHT STAYS ON, EXAMINE THE PINS, CONNECTORS AND WIRING (WDM 30-41-11,-12).

The Overheat Light Comes On
Figure 101

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737-300/400/500MAINTENANCE MANUAL
PREREQUISITES FOR THE NO. 1 AND
ELECTRICAL POWER (AMM 24-22-00/201) NO. 2 WINDOWS, THE WINDOW ANTI-ICE SWITCHES ON POWER ON LIGHT DOES NOT COME ON

For the No. 1 and No. 2 Windows, the Power On Light Does Not Come On Figure 102 (Sheet 1)
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737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1
(BLOCK 3)
YES

NO NO

4
IS THERE 115V AC AT THIS
22 IS THERE 115V AC AT THIS
CONNECTOR ON THE E3-3 RACK? CONNECTOR ON THE P5-9 MODULE?

WINDOW NO. 1 WINDOW NO. 1

RIGHT - D1048A PIN 5 RIGHT - D644 PIN 15
 LEFT - D1044A PIN 5 LEFT - D638 PIN 21

WINDOW NO. 2WINDOW NO. 2 RIGHT - D1042A PIN 5 RIGHT - D638 PIN 8 LEFT - D1046A PIN 5 LEFT - D644 PIN 42

YES
YES
NO NO

5 IS THERE 28V DC AT THIS
23 IS THERE 28V DC AT THIS
CONNECTOR ON THE E3-3 RACK? CONNECTOR ON THE P5-9 MODULE?

WINDOW NO. 1 WINDOW NO. 1

RIGHT - D1048A PIN 11 RIGHT - D644 PIN 14 LEFT - D1044A PIN 11 LEFT - D638 PIN 20
WINDOW NO. 2 WINDOW NO. 2 RIGHT - D1042A PIN 11 RIGHT - D638 PIN 7 LEFT - D1046A PIN 11 LEFT - D644 PIN 41

YES YES
NO

6 IS THERE 115V AC AT THIS
CONNECTOR ON THE E3-3 RACK?

WINDOW NO. 1
 RIGHT - D1048B PIN 2
 LEFT - D1044B PIN 2

WINDOW NO. 2
 RIGHT - D1042B PIN 2
 LEFT D1046B PIN 2

YES

For the No. 1 and No. 2 Windows, the Power On Light Does Not Come On
Figure 102 (Sheet 2)

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THE WINDOW ANTI-ICE PREREQUISITES LIGHTS DO NOT
THE WINDOW ANTI-ICE SWITCHES ARE OFF OPERATE CORRECTLY THE WINDOW IS COOL WHEN THE LIGHT TEST
SWITCH IS IN THE TEST POSITION.

The Window Anti-Ice Lights Do Not Operate Correctly When the
Light Test Switch is in the Test Position
Figure 103

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