Suzuki XL7 2007 Service Manual page 935

Load Test
CAUTION
!
Do not turn the parasitic draw test switch to
the OFF position with the engine running.
Damage will occur to the vehicle's electrical
system.
CAUTION
!
The test switch must be in the ON position
when removing the fuses in order to maintain
continuity in the electrical system. This
avoids damaging the digital multimeter due
to accidental overloading, such as a door
being opened to change a fuse.
NOTE
The switch knob on the J 38758 is marked ON
and OFF. When the switch knob is in the ON
position, the circuit is closed and electrical
current will pass through the switch. When
the switch knob is in the OFF position, the
circuit is open and electrical current will not
pass through the switch.
WARNING
!
Refer to "Battery Disconnect Caution".
1. Disconnect the battery negative cable from the
battery negative terminal.
2. Install the male end of the J 38758 to the battery
ground terminal.
3. Turn the J 38758 knob to the OFF position.
4. Install the battery negative cable to the female end of
the J 38758.
5. Turn the J 38758 knob to the ON position.
6. Road test the vehicle and activate ALL of the
accessories, including the radio and air conditioning
(A/C). This may take up to 30 minutes.
NOTE
Leaving the key in the ignition on some
vehicles may cause a parasitic drain that is
above the recommended amount. Refer to
"Body Control System Description and
Operation: ".
7. Park the vehicle. Turn the ignition switch to the OFF
position and remove the ignition switch key.
8. Connect a 10-amp fused jumper wire to the test
switch tool terminals.
9. Turn the J 38758 knob to the OFF position. The
current now flows through the jumper wire.
10. Wait 1 minute. If the fuse blows, install an inductive
ammeter and go to step 20.
11. Remove the fused jumper wire.
12. Set a digital multimeter to the 10A scale.
13. Connect the digital multimeter to the test switch tool
terminals.
14. Turn the J 38758 knob to the OFF position. The
current flows now through the digital multimeter.
15. Wait 1 minute. Inspect and record the current
reading.
a. When there is a current reading on 2A or less,
turn the J 38758 knob to the ON position. The
electrical current will now pass through the
switch.
b. Then switch the digital multimeter down to the 2A
scale for a more accurate reading when the J
38758 knob is turned OFF.
16. Turn the J 38758 knob to the OFF position. Wait 15
minutes for most vehicles.
17. Inspect and record the current reading.
18. Note the battery Reserve Capacity (Amp Hour
rating). Refer to "Battery Usage".
a. Divide the reserve capacity by 4 (Amp hour
rating by 2.4).
b. Compare this to the multimeter milliamp reading
taken in the previous step. The parasitic current
drain should not exceed this number. Example: If
a battery has a reserve capacity of 100 minutes,
(60 A/H) the current drain should not exceed 25
mA.
19. If excessive current drain is not found at this time
and there are no other apparent causes, complete
the following:
a. Using the MIN/MAX function of the digital
multimeter, monitor the parasitic drain overnight
or during the day. This will determine if
something has been activated during that time
frame.
CAUTION
!
The test switch must be in the ON position
when removing the fuses in order to maintain
continuity in the electrical system. This
avoids damaging the digital multimeter due
to accidental overloading, such as a door
being opened to change a fuse.
NOTE
Removing fuses, relays, and connectors to
determine the failure area may wake up
modules. You must wait for these modules to
go to sleep or use the sleep function on the
scan tool.
Charging System: 1J-42