IQDM Troubleshooting
IQDM Service Tool Owner’s Manual
Page 23
IQDM display screen is blank,
continued
IQDM jack (on vehicle F&R switch) has
failed
Test Procedure 3 – IQDM Jacks (Located
on Vehicle F&R Switch and speed
controller) on page 25
Contrast Setting is too light
See Contrast Adjustment on page 22.
Onboard computer is in power-down
mode
Drive the vehicle for a short distance and
reconnect the IQDM to the vehicle.
Onboard computer malfunction
Section 11 – Electrical System and
Testing in the IQ System Maintenance and
Service Supplement
Loose vehicle wire harness connections
Test Procedure 3 – IQDM Jacks (Located
on Vehicle F&R Switch and speed
controller) on page 25
Speed controller malfunction
Section 11 – Electrical System and
Testing in the IQ System Maintenance and
Service Supplement
IQDM has failed
Replace IQDM
Menu items appear as numbers, rather
than text
IQDM is in "numeric" language mode.
See Language Selection on page 22.
Display screen shows jumbled or
undecipherable characters
Speed controller malfunction
Section 11 – Electrical System and
Testing in the IQ System Maintenance and
Service Supplement
IQDM malfunction
Disconnect the IQDM cord from the
vehicle. Wait a few seconds and reconnect
the IQDM to the vehicle
IQDM Display screen LCD is damaged
Test Procedure 4 – LCD Display Screen
Test on page 26
Loose connection at IQDM jack
Test Procedure 3 – IQDM Jacks (Located
on Vehicle F&R Switch and speed
controller) on page 25
Intermittent IQDM cord failure
Test Procedure 1 – IQDM Cord on
page 24
Intermittent IQDM cord adaptor failure
Test Procedure 2 – IQDM Cord Adaptor
on page 24
Loose vehicle wire harness connections
Test Procedure 3 – IQDM Jacks (Located
on Vehicle F&R Switch and speed
controller) on page 25
IQDM is “locked-up” – buttons do not
respond
IQDM malfunction
Disconnect the IQDM cord from the
vehicle. Wait a few seconds and reconnect
the IQDM to the vehicle
Vehicle batteries – loose terminals or
corrosion
Section 13 – Batteries in the IQ System
Maintenance and Service Supplement
Vehicle batteries – improperly wired
Section 13 – Batteries in the IQ System
Maintenance and Service Supplement
Vehicle batteries – batteries failed
Section 13 – Batteries in the IQ System
Maintenance and Service Supplement
Vehicle batteries – batteries not fully
charged
Section 13 – Batteries in the IQ System
Maintenance and Service Supplement
Speed controller malfunction
Section 11 – Electrical System and
Testing in the IQ System Maintenance and
Service Supplement
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Summary of Contents for IQDM
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