Guardian 4389 Repair Manual page 100

SECTION 4.3
TROUBLESHOOTING FLOW CHARTS
RESULTS:
1. Replace AUTO-OFF-MANUAL switch, if defective.
2. For Problem 8 Only: If the switch passes the tests, verify
the REMOTE NOT AUTO dipswitch is set to OFF on the
circuit board (see Figure 3, Section 4.1) then proceed to
Test 44.
3. For Problem 9 Only: If the switch passes the tests, pro-
ceed to Test 60.
TERMINALS SWITCH POSITION
2 and 3 AUTO
MANUAL
OFF
2 and 1 AUTO
MANUAL
OFF
5 and 6 AUTO
MANUAL
OFF
5 and 4 AUTO
MANUAL
OFF
15A
178
15
SW1
1 4
17
2 5
3 6
15
239
183
Figure 2. AUTO-OFF-MANUAL Switch Test Points
TEST 44- CHECK WIRE 15/15A/17/239 VOLTAGE
DISCUSSION:
The circuit board will not turn on unless battery volt-
age is available to the board via Wire 15, the AUTO-
OFF-MANUAL switch and Wire 15A. If battery volt-
age is not available, automatic or manual operation
will not be possible.
Battery voltage is available to Wire 17 from pin loca-
tion 11 of the J1 connector on the circuit board.
When the AUTO-OFF-MANUAL switch is in the MAN-
UAL position, Wire 239 supplies battery voltage to Pin
Location 9 of the circuit board, and engine cranking
occurs.
Page 98
READING
C
ONTINUITY
I
NFINITY
I
NFINITY
I
NFINITY
C
ONTINUITY
I
NFINITY
C
ONTINUITY
I
NFINITY
I
NFINITY
I
NFINITY
C
ONTINUITY
I
NFINITY
IF EQUIPPED
183
17
AUTO
239
178
6
5 4
SW1
2
3
1
15
MANUAL
15A
SCHEMATIC
PART 4
PROCEDURE
(For Problem 1 flow chart, do Steps 1-5 and Step 9 only)
(For Problem 2 flow chart, do all steps)
1. Set a VOM to measure DC voltage.
2. Connect the positive (+) test lead to the AUTO-OFF-
MANUAL switch Terminal 2, Wire 15. Connect the neg-
ative (-) test lead to a clean frame ground. Battery volt-
age should be measured (See Figure. 2).
3. Connect the positive (+) test lead to the AUTO-OFF-
MANUAL switch Terminal 1, Wire 15A. Connect the
negative (-) test lead to a clean frame ground. Set the
AUTO-OFF-MANUAL switch to MANUAL. Battery volt-
age should be measured.
4. Connect the positive (+) test lead to Pin location 12 Wire
15 at the J1 connector on the circuit board. Connect the
negative (-) test lead to a clean frame ground. Battery
voltage should be measured.
5. Connect the positive (+) test lead to pin location 10,
Wire 15A at the J1 connector on the circuit board.
Connect the negative test lead to a clean frame ground.
Set the AUTO-OFF-MANUAL switch to the MANUAL
position. Battery voltage should be measured. Repeat
Step 5. This time set the AUTO-OFF-MANUAL switch
to AUTO. Battery voltage should be measured.
6. Connect the positive (+) test lead to pin location 9, Wire
239 at the J1 connector on the circuit board. Connect
the negative (-) test lead to a clean frame ground. Set
the AUTO-OFF-MANUAL switch to the MANUAL posi-
tion. Battery voltage should be measured. If battery
voltage is measured, stop and proceed to results. If bat-
tery voltage is not measured, proceed to Step 7.
7. Connect the positive (+) test lead to the AUTO-OFF-
MANUAL switch Terminal 4, Wire 17/178. Connect the
negative (-) test lead to a clean frame ground. Battery
voltage should be measured.
8. Connect the positive (+) test lead to Pin location 11,
Wire 17 at the J1 connector on the circuit board.
Connect the negative (-) test lead to a clean frame
ground. Battery voltage should be measured.
9. Set a VOM to measure resistance "R x 1" scale.
Connect one meter test lead to a clean frame ground.
Connect the other test lead to Pin location 13, Wire 0 at
the J1 connector on the circuit board. CONTINUITY
should be measured.
RESULTS:
1. No battery voltage in Step 2. Go to test 45 or
repair/replace Wire 15 from F1 to SW1.
2. No battery voltage in Step 3. Go to Test 43 or repair or
DC CONTROL