Power Mirror System Diagnostic Tests - Case IH AFX8010 Repair Manual

POWER MIRROR SYSTEM DIAGNOSTIC TESTS

NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for
these tests. For battery testing and service, see the battery section in the service manual.
DO NOT use a self-powered test light for any of these tests. Use of a self-powered test light can cause
damage to components in this system.
Before performing any of the electrical tests, be sure all operating controls are in neutral or park lock
position. This will eliminate accidental movement of the machine or start-up of power driven equipment.
Test Point
1 Turn the Key Switch S-02
ON with the engine OFF.
Check the voltage at Mirror
Adjust Switch S-27
connector X126 (pin H).
2 Disconnect the Mirror
Adjust Switch S-27
connector X126.
Check the voltage at
(pin H).
3 Check the resistance on
circuit 949 (BK) between
Mirror Adjust Switch S-27
connector X126 (pin A)
and ground.
4 Set Mirror Adjust Switch
S-27 selector to Left mirror.
Hold Mirror Adjust Switch
S-27 in "IN" position.
Check the voltage at Mirror
Adjust Switch S-27
connector X126 (pin C).
5 Hold Mirror Adjust Switch
S-27 in OUT position.
Check the voltage at Mirror
Adjust Switch S-27
connector X126 (pin B).
6 Hold Mirror Adjust Switch
S-27 in DOWN position.
Check the voltage at Mirror
Adjust Switch S-27 (pin D).
BODY AND STRUCTURE - USER PLATFORM
CAUTION
WARNING
A - MIRROR ADJUST SWITCH TEST
Good Reading
12 volts
If good reading, go to test
point 3.
12 volts
If good reading,
Go to next test point.
Less than 1 ohm
If good reading, go to next
test point.
12 volts
If good reading, go to next
test point.
12 volts
If good reading, go to next
test point.
12 volts
If good reading, go to next
test point.
E.34 / 20
Possible Cause of Bad Reading
Open circuit 274 (OR) or 79 (OR)
between Fuse F09 and Mirror Adjust
Switch S-27 (pin H). Check in-line
connector X002 (pin 8) for connection.
Short to ground in circuit 274 (OR) or 79
(OR).
A short to ground will blow Fuse F09.
Mirror Adjust Switch S-27.
Go to next test point.
Open or short circuit 274 (OR) or 79
(OR) between Fuse F09 and Mirror
Adjust Switch S-27 connector X126
(pin H).
Open circuit 949 (BK) between Mirror
Adjust Switch S-27 connector X126
(pin A) and ground.
Mirror Adjust Switch S-27.
Short to ground which affects circuit 961
(GY). Check the X036 in-line connector
(pin 25) for connection. A short to
ground will blow Fuse F09.
Mirror Adjust Switch S-27.
Short to ground which affects circuit 959
(WH). Check the X036 in-line connector
(pin 23) for connection. A short to
ground will blow Fuse F09.
Mirror Adjust Switch S-27.
Short to ground which affects circuit 958
(WH). Check the X036 in-line connector
(pin 22) for connection. A short to
ground will blow Fuse F09.