TURN SIGNAL LAMPS
When the left control stalk of the multi-function switch is moved up (right turn) or down (left turn), the turn signal
system is activated causing the selected right or left turn signal indicators and turn signal lamps to flash on and off.
When the turn signal system is activated, the circuitry within the turn signal switch and the hazard switch/electronic
combination flasher unit will repeatedly energize and de-energize one of two internal relays that switch battery volt-
age from a fused ignition switch output (run) fuse in the Junction Block (JB) to the appropriate turn signal indicator
and turn signal lamps.
The ElectroMechanical Instrument Cluster (EMIC) chime tone transducer will generate an audible turn signal cancel
warning each time the vehicle is driven for a distance of about 3.2 kilometers (about two miles) with a turn signal
indicator flashing. The EMIC uses Programmable Communications Interface (PCI) data bus distance messages from
the Powertrain Control Module (PCM) and a hard wired input from the turn signal switch circuitry or the multi-func-
tion switch to determine when to sound the turn signal cancel warning.
WARNING
WARNINGS - LAMPS/LIGHTING - EXTERIOR
WARNING:: To avoid personal injury or death, eye protection should be used when servicing any glass
components.
CAUTION: Do not contaminate the glass of halogen bulbs with fingerprints or allow contact with other pos-
sibly oily surfaces. Reduced bulb life will result.
CAUTION: Do not use bulbs with higher candle power than indicated in the Bulb Application table (Refer to
8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR - SPECIFICATIONS). In addition, do not use fuses, circuit
breakers or relays having greater amperage value than indicated on the fuse panel or in the Owner’s Man-
ual. Damage to lamps, lenses, wiring and other related electrical components can result.
DIAGNOSIS AND TESTING
LAMPS/LIGHTING - EXTERIOR
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
NOTE: When diagnosing the exterior lighting circuits, remember that high generator output can burn out
bulbs rapidly and repeatedly; and, that dim or flickering bulbs can be caused by low generator output or
poor battery condition. If one of these symptoms is a problem on the vehicle, be certain to diagnose the
battery and charging system, then repair as necessary.
NOTE: A good ground is necessary for proper lighting operation. If a lighting problem is being diagnosed
that involves multiple symptoms, systems, or components, the problem can often be traced to a loose, cor-
roded, or open ground.
The hard wired exterior lamp and lighting circuits may be diagnosed and tested using conventional diagnostic tools
and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper
wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information
and location views for the various wire harness connectors, splices and grounds.
However, conventional diagnostic methods may not prove conclusive in the diagnosis of the Body Control Module
(BCM), the ElectroMechanical Instrument Cluster (EMIC), the Powertrain Control Module (PCM), the Programmable
8L - 34
LAMPS/LIGHTING - EXTERIOR
KJ