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MI91.327I

01NOV11

PART 7. MANUAL OPERATION OF THE JACKS.

the ignition is on and the park brake is set. Each set of UP and DOWN arrows on the manual side of
the touch panel control two jacks; both front, both rear, the left front and left rear or the right front
and the right rear. The UP arrows extend the jacks and lift the vehicle. The DOWN arrows retract the
jacks and lower the vehicle. The pump should only run when an UP arrow is pushed. When a jack
extends between 1/2 inch and 1 inch, the red warning light for that jack will come on and the
"TRAVEL MODE" light will go out. If the ignition is in the ON position, the master "JACKS DOWN"
warning light and the warning buzzer will also come on. Some systems are wired so the master
warning light will come on if the ignition is in the ACC. position but the buzzer will come on only
if the ignition is in the ON position.

all the dump valves must be stuck open and need to be replaced.

+12 volts is shorted to the 9300 dump wire in the harness. Correct this problem.

If the LED goes out with the 3 pin Packard connector

unplug the touch panel. If the LED goes out with the touch panel unplugged, replace the touch panel.

unplug the 3 pin Packard connector at the I/O module.

If the LED is off,

unplugged,

If the LED remains on, replace the I/O module.

If the LED is on,

If the LED stays on,

SECTION B.3. CONTINUED

PART 6.

The DUMP LED is not on while pushing the DUMP button.
the I/O module. Turn the ignition off. Unplug the 32 pin harness connector at the I/O module. Wait
about 10 - 15 seconds and plug the 32 pin connector back in. Turn the ignition on. Check the dump

3. THE VEHICLE WILL NOT RETURN TO RIDE HEIGHT.
there is adequate air in the suspension air tanks. Any time the suspension air tanks are full the vehicle
should return to ride height. There should be no air coming from the HWH air dump valves. If there is

the vehicle manufacturer for assistance. If only one valve is exhausting air, replace the valve. If all the
valves are exhausting air, check the dump LED on the I/O module.

no air exhausting from the HWH dump valves, there is a problem with the vehicle suspension. Contact

The DUMP LED is on while pushing the DUMP button, air will not dump from the suspension.
Unplug the 3 pin Packard connector at the I/O module and check for voltage between the white ground
wire in pin A and the 9300 dump wire in pin B. If there is no voltage, make sure the wire to the pin
connections for both wires are ok. Fix if necessary. If the connections are ok, replace the I/O board.
If there is voltage between the white wire and the 9300 wire, plug the connector back in and locate
the HWH air dump valves. Check for voltage between the white wire and the 9300 dump wire at the
dump valve. If there is good voltage (10 volt or more) at the 4 pin UML connector, with the connector
plugged in, the problem is with the suspension dump equipment, contact the vehicle manufacturer.
If there is no voltage at the 4 pin UML connector, the problem is with the connections or harness wires
between the 3 pin Packard connector and the 4 pin UML connector.

SEE: MP84.3135 and MP84.3170

SEE: MP843135

Start the vehicle engine and make sure

Unplug the 3 pin Packard connector at

MANUAL SYSTEM OPERATION

725 TROUBLE SHOOTING STEPS

LED while pushing the DUMP button. If the LED is still off, the problem is most likely the I/O module

but could be the touch panel. If the LED is now on, there is a short in the harness to the HWH dump
valves or one or more HWH air dump valves are bad. Locate and unplug all HWH air dump valves.
Plug the 3 pin Packard connector back in. Check the dump LED while pushing the DUMP button. If
the LED is off or goes out, there is a short to ground on the 9300 dump wire in the harness between
the 3 pin Packard connector and the HWH air dump valves. If the LED stays on, one or more of the

HWH valves is bad. Plug one valve at a time back in. Check the dump LED while pushing the DUMP
button. If the dump LED stays on, the valve is good. If the light does not come on or goes out, replace

the valve. If the dump LED goes out while checking a valve, unplug the bad valve, turn the ignition

off, and wait about a half minute before turning the ignition on and testing another valve.

SEE: MP84.3170

The jacks can be manually operated when

MP84.3170

3 2

6111

DO NOT CUT

TERMINATING

PUMP RELAY

LINK LIGHT

MASTER RELAY