Suzuki XL7 2007 Service Manual page 2264

9A-156 Wiring Systems:
With a Test Lamp
NOTE
Only use the test lamp procedure on low
impedance power and ground circuits.
1. Remove the power feed (i.e. fuse, control module)
from the suspect circuit.
2. Disconnect the load.
3. Connect one lead of the test lamp to one end of the
circuit to be tested.
4. Connect the other lead of the test lamp to battery
positive voltage.
5. Connect the other end of the circuit to ground.
6. If the test lamp illuminates (full intensity), then the
circuit has good continuity.
Testing for Short to Ground
CAUTION
!
Refer to Test Probe Notice.
The following procedures test for a short to ground in a
circuit.
With a DMM
1. Remove the power feed (i.e. fuse, control module)
from the suspect circuit.
2. Disconnect the load.
3. Set the rotary dial of the DMM to the ohm position.
4. Connect one lead of the DMM to one end of the
circuit to be tested.
5. Connect the other lead of the DMM to a good
ground.
6. If the DMM does NOT display infinite resistance
(OL), there is a short to ground in the circuit.
With a Test Lamp
1. Remove the power feed (i.e. fuse, control module)
from the suspect circuit.
2. Disconnect the load.
3. Connect one lead of the test lamp to battery positive
voltage.
4. Connect the other lead of the test lamp to one end of
the circuit to be tested.
5. If the test lamp illuminates, there is a short to ground
in the circuit.
Fuse Powering Several Loads
1. Review the system schematic and locate the fuse
that is open.
2. Open the first connector or switch leading from the
fuse to each load.
3. Connect a DMM across the fuse terminals (be sure
that the fuse is powered).
– When the DMM displays voltage the short is in the
wiring leading to the first connector or switch.
– If the DMM does not display voltage refer to the
next step.
4. Close each connector or switch until the DMM
displays voltage in order to find which circuit is
shorted.
Testing for a Short to Voltage
CAUTION
!
Refer to Test Probe Notice.
The following procedure tests for a short to voltage in a
circuit.
1. Set the rotary dial of the DMM to the V (DC) position.
2. Connect the positive lead of the DMM to one end of
the circuit to be tested.
3. Connect the negative lead of the DMM to a good
ground.
4. Turn ON the ignition and operate all accessories.
5. If the voltage measured is greater than 1 volt, there
is a short to voltage in the circuit.
Testing for Intermittent Conditions and
Poor Connections
Special tool
J 35616 GM-Approved Terminal Test Kit
J-38125 Terminal Repair Kit
When the condition is not currently present, but is
indicated in DTC history, the cause may be intermittent.
An intermittent may also be the cause when there is a
customer complaint, but the symptom cannot be
duplicated. Refer to the Symptom Table of the system
that is suspect of causing the condition before trying to
locate an intermittent condition.
Most intermittent conditions are caused by faulty
electrical connections or wiring. Inspect for the following
items:
• Wiring broken inside the insulation
• Poor connection between the male and female
terminal at a connector
• Poor terminal to wire connection—Some conditions
which fall under this description are poor crimps, poor
solder joints, crimping over the wire insulation rather
than the wire itself, and corrosion in the wire to
terminal contact area, etc.