Turn Signal Lamps And/Or Indicators Inoperative - Suzuki XL7 2007 Service Manual

Turn Signal Lamps and/or Indicators Inoperative

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " 3 prior to using this diagnostic procedure.
• "Strategy Based Diagnosis: "
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: "
Diagnostic Fault Information
Circuit
Turn Signal Ground Circuit
Turn Signal Switch
1. Turn Signal Lamps and/or Indicators Inoperative
Circuit/System Description
Voltage runs through the left and right turn signal fuses
of the instrument panel I/P fuse block, then through the
body control module BCM, before reaching the turn
signal multifunction switch. When the turn signal switch
is engaged, the switch closes and supplies voltage to the
front and rear park/turn signal lamps.
Diagnostic Aids
• An open/high resistance or a short to ground in the
turn signal multifunction switch would cause the turn
signal lamps to become inoperative.
• There are certain relays that are PCB or soldered to
the underhood fuseblock circuit board and any relay
replacement would warrant a replacement of the
underhood fuseblock.
• This vehicle is not equipped with a turn signal relay.
Reference Information
Schematic Reference
• "Exterior Lights Schematics: "
• "Displays and Gages Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Data Definitions - Lighting: "
• "Scan Tool Data List - Lighting: "
• "Scan Tool Output Controls - Lighting: "
Circuit/System Verification
Ignition ON, observe right or left turn signal while
engaging the turn signal multifunction switch in the
appropriate position. The selected bulbs should
illuminate.
Instrumentation / Driver Info. / Horn:
Short to Open/High
Ground Resistance
1 1
1 1
Circuit/System Testing
Turn Signal Multifunction Switch Circuit Testing
1. Ignition OFF, disconnect the harness connector at
the turn signal multifunction switch.
2. Ignition ON, install a test lamp between the turn
signal voltage supply circuit and ground. The test
lamp should flash ON and OFF.
➢ If the test lamp does not flash, test the voltage
supply circuit for a short to ground or an open/high
resistance.
3. Install a 3-amp fused jumper wire between the
voltage supply circuit and the turn signal circuit.
Verify that the proper turn signal lamps are ON.
➢ If the turn signals are not ON, test the signal circuit
of the turn signal multifunction switch for a short to
voltage, short to ground or an open/high resistance.
4. If all circuits test normal, test or replace the turn
signal multifunction switch.
Park/Turn Signal/Turn Signal Indicator Circuit
Testing
1. Ignition OFF, remove the inoperative light bulb.
2. Test for less than 1.0 ohm of resistance between the
ground circuit and ground.
➢ If greater than 1.0 ohm, test the ground circuit for
an open/high resistance.
3. Connect a test lamp between the control circuit and
the ground circuit.
4. Ignition ON, turn ON the appropriate turn signal, the
test lamp should flash.
➢ If the test lamp remains ON all the time, test for a
short to voltage on the control circuit. If the circuit
tests normal, test or replace the BCM.
➢ If the test lamp remains OFF all the time, test for a
short to ground or an open/high resistance on the
control circuit. If the circuit tests normal, test or
replace the turn signal multifunction switch.
5. If all circuits test normal, test or replace the light
bulb.
Signal
Short to Voltage
Performance
—
—
9C-52
—
—