Suzuki XL7 2007 Service Manual page 2390

9B-69 Lighting Systems:
Component Testing
Hazard Switch Testing
1. Ignition OFF, disconnect the harness connector at
the hazard switch, terminal B.
2. Test for infinite resistance between the signal
terminals and the voltage supply terminal with the
switch in the open position.
➢ If less than infinite resistance, replace the hazard
switch.
Headlamp Low or High Beams Always On
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
Diagnostic Fault Information
Circuit
Headlamp Control Circuit in DRL Setting
Headlamp Relay Control Circuit
Park Lamp Switch Signal Circuit
Headlamp Switch Supply Circuit
Headlamp Switch Ground Circuit
Relay Switch Signal Circuit
1. Headlamps Always ON Low or High Beam
2. Headlamps Inoperative Low or High Beam
Circuit/System Description
The headlamp may be turned on 2 different ways. First,
when the driver places the headlamp switch in the ON
position, for manual operation. Second, with the
headlamp switch placed in the OFF position activating
automatic lamp control (ALC). The LH HDLP and RH
HDLP fuse in the fuse block - underhood, supply battery
positive voltage to both low and high beam lamps at all
times. For manual operation, when the headlamp switch
is in the ON position, the headlamp switch supplies
ground directly to the headlamps and to the body control
module (BCM) on the headlamp low or high beam signal
circuit, depending on the position of the headlamp
dimmer switch. The BCM uses this signal to determines
if the conditions are present to illuminate the daytime
running lamps or park lamps.
3. Test for less than 1.5 ohms between the signal
terminals and the voltage supply terminal with the
switch in the closed position.
➢ If greater than the specified range, replace the
hazard switch.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Hazard Warning Switch Replacement"
• "Control Module References: " for BCM replacement,
setup, and programming.
Short to Open/High
Ground Resistance
B2575 B2575
1 2
1 2
2 2
— 2
1 2
Diagnostic Aids
Both the High Beam and Low Beam relays are soldered
into the underhood fuseblock circuit board. The
replacement of the underhood fuseblock is needed upon
replacement of the High Beam and Low Beam relays.
A short to voltage, short to ground in the following
location may cause a malfunction to occur:
• The headlamp relay control circuit.
• The headlamp relay
• The BCM.
• The headlamp switch
Signal
Short to Voltage
Performance
B2575
2
2
—
2
2
—
—
—
—
—
—