14
IQDM and IQDM-P Handset Troubleshooting
IQ DISPLAY MODULE (IQDM) AND IQDM-P
DIAGNOSTICS: EXCEL SYSTEM
IQDM AND IQDM-P HANDSET TROUBLESHOOTING
In the event that the handset does not function as described in this manual, the following troubleshooting guide should
be studied and the referenced test procedures should be performed to troubleshoot the handset.
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Handset cord and/or adaptor is disconnected
See Plugging the Handset into the Vehicle
on page 14-1.
Vehicle batteries – loose terminals or corrosion
Section 16 — Batteries
Vehicle batteries – improperly wired
Section 16 — Batteries
Vehicle batteries – batteries failed
Section 16 — Batteries
Vehicle batteries – batteries not fully charged
Section 16 — Batteries
Handset cord has failed
Test Procedure 1 – Handset Cord on page
14-19
Handset cord adaptor has failed
Test Procedure 2 – Handset Cord Adaptor on
page 14-19
IQDM port (mounted under instrument panel
assembly) has failed
Test Procedure 3 – IQDM Ports on page 14-20
Contrast Setting is too light
See Program on page 14-17.
Onboard computer is in power-down mode
Drive the vehicle for a short distance and
reconnect the handset to the vehicle
Onboard computer malfunction
Section 12 — Excel System Troubleshooting
Loose vehicle wire harness connections
Test Procedure 3 – IQDM Ports on page 14-20
Speed controller malfunction
Section 12 — Excel System Troubleshooting
Handset display screen is blank
Handset has failed
Replace handset
Speed controller malfunction
Section 12 — Excel System Troubleshooting
Handset malfunction
Disconnect the IQDM cord from the vehicle.
Wait a few seconds and reconnect the handset
to the vehicle
Loose connection at IQDM port
Test Procedure 3 – IQDM Ports on page 14-20
Intermittent handset cord failure
Test Procedure 1 – Handset Cord on page
14-19
Intermittent handset cord adaptor failure
Test Procedure 2 – Handset Cord Adaptor on
page 14-19
Display screen shows jumbled or
undecipherable characters
Loose vehicle wire harness connections
Test Procedure 3 – IQDM Ports on page 14-20
TABLE CONTINUED ON NEXT PAGE
Page 14-18
2009 Electric Precedent Maintenance and Service Manual