Suzuki XL7 2007 Service Manual page 2248

9A-140 Wiring Systems:
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
➢ If either of the DTCs are set, refer to "Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Information: ".
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed
with the corresponding ignition key position. The PMM Power Mode Parameters table below illustrates the correct
state of these input parameters (circuits) in correspondence to the ignition switch position. The circuits which the
individual parameters are related to are in parentheses.
PMM Power Mode Parameters
Ignition Switch Currant Power
Position
Off Key Out
Off Key IN
Accessory Accessory
Run
Start Crank Request
➢ If any parameters are incorrect in any key position, proceed to the Circuit/System Testing or Component Testing
below.
Circuit/System Testing
NOTE
You must perform the Circuit/System
Verification before proceeding with Circuit/
System Testing.
1. Inspect the Ign Switch fuse for open. The fuse
should be OK.
➢ If the fuse is open, test the following circuits for a
short to ground, if all circuits test OK, replace the
BCM.
– Battery positive voltage of the ignition switch
– Accessory voltage
– Off/Run crank voltage
– Ignition 1 voltage
2. Disconnect the ignition switch connector.
3. Test for battery positive voltage between the battery
positive voltage circuit of the ignition switch and
ground.
➢ If less than battery positive voltage, repair the
circuit for an open/high resistance
NOTE
The ignition switch component test must be
preformed before proceeding with this test to
verify the integrity of the switch.
Ign. Off/Run/Crank
(Off/Run Crank voltage
Mode
circuit)
Off Key Out/ACC
Off Key In/Off
Key Out/ACC
Run Run
Crank
Ignition Accessory/Run
(Accessory voltage
circuit)
Inactive
Inactive
Active
Active
Inactive
4. Perform the ignition switch component test.
➢ If the ignition switch fails, replace the ignition
switch.
5. Ignition OFF, disconnect BCM connector C1, test for
less than 1.0 volt between the following circuits of
the BCM and ground.
6. Ignition key out, test for less than 1.0 volt between
the following circuits of the BCM and ground.
– Ignition key resistor signal
– Off/Run crank
– Accessory voltage
– Ignition 1 voltage
➢ If more than 1.0 volt, repair the circuit for a short to
voltage.
7. Test for less than 1.0 ohm of resistance between the
BCM and the ignition switch on the following circuits.
– Ignition key resistor signal
– Off/Run crank
– Accessory voltage
– Ignition 1 voltage
➢ If greater than 5 ohms, repair the circuit for open/
high resistance
8. Test for infinite resistance between the ignition key
resistor signal circuit of the BCM and ground.
➢ If less than infinite resistance, repair the signal
circuit for a short to ground.
9. Replace the BCM.
Ignition Run/Crank
(Ignition 1 Voltage
circuit)
Inactive
Inactive
Inactive
Active
Active