(2)  
Make sure the CONTROL PANEL switch on the instrument switching module is set to NORMAL.

(a)  
If the MAP/WXR RANGE DISAGREE message does not show on the first officer’s display, then there was an intermittent fault.

(b)  
If the MAP/WXR RANGE DISAGREE message shows on the first officer’s display, then do the Fault Isolation Procedure below.

EFFECTIVITY SIL ALL  34-43 TASK 811 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 242 Feb 15/2011 

F.  Fault Isolation Procedure
(1)  For
DEU-2,
do
this
task:
CDS
BITE
Procedure,
31-62
TASK
801.

Look for any of the maintenance messages related to the LRUs that follow:

(a)  
EFIS control panel

(b)  
Weather radar

(c)  
Flight management computer

(d)  
Display electronic unit

1)  If any of the above maintenance messages show, then go to the FIM task for that message.
2)  If the MAP/WXR RANGE DISAGREE message does not show on the first officer’s display, then you corrected the fault.
3)  If the MAP/WXR RANGE DISAGREE message shows on the first officer’s display, then continue.
(2)  Do this check of the wiring between the weather radar receiver/transmitter and the first officer’s DEU-2:
(a)  
Remove the weather radar receiver/transmitter, M101. To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.

(b)  
Remove the first officer’s DEU-2, M1809. To move it, do this task: AMM
TASK 31-62-21-000-801.

(c)  
Do a wiring check between the weather radar receiver/transmitter connector D189B, and the first officer’s DEU-2 connector D3975F (WDM 34-41-11).

D3975B  D189B
pinC7 ------------------pinJ3 pinB7 ------------------pinJ4

(d)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the weather radar receiver/transmitter, M101. To install it, do this task:
Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801. 3) Re-install the first officer’s DEU-2, M1809. To install it, do this task: AMM TASK 31-62-21-400-801. 4) Do this task: Weather Radar (WXR) System -Operational Test, AMM
TASK 34-43-00-710-802-001 or Weather Radar (WXR) System -Operational Test,
AMM TASK 34-43-00-710-803-002.
a) If the weather radar operational test passes, then you corrected the fault.

(e)  If you do not find a problem with the wiring, then continue.
1)  Re-install the weather radar receiver/transmitter, M101. To install it, do this task: Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801.
2)  Re-install the captain’s DEU-2, M1809. To install it, do this task: AMM TASK 31-62-21-400-801.
SIL 014, 015, 020
(3)  Do this check of the wiring between the Left (Right) weather radar receiver/transmitter and the first officer’s DEU-2:
EFFECTIVITY SIL ALL  34-43 TASK 811 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 243 Feb 15/2011 

(a)  
Remove the Left (Right) weather radar receiver/transmitter, M101 (M460). To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.

(b)  
Remove the first officer’s DEU-2, M1809. To move it, do this task: AMM TASK 31-62-21-000-801.

(c)  
Do a wiring check between the Left (Right) weather radar receiver/transmitter connector D189B (D673B), and the first officer’s DEU-2 connector D3975B (WDM 34-41-11).
　
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