Description

DESCRIPTION

LAMP SYSTEMS


Lighting circuits are protected by fuses and other circuits are high side drivers. High side drivers, (HSD) are computer controlled solid state switching circuits within the Totally Integrated Power Module (TIPM). If there were a short in the lighting circuit that was HSD operated, The TIPM would sense the short and protect the circuit from being damaged by making several attempts to actuate, then shut off. The Tail lamps, parking lamps, headlamps left and right stop lamps, left and right turn signal lamps, fog lamps (if equipped), side repeater lamps are all on HSD within the TIPM. The reverse lamps are fused and relay controlled through the TIPM. The Center High Mounted Stop Lamp (CHMSL) is fused battery.

The headlamp switch and multi function switch control the exterior lighting by providing inputs to the TIPM over the bus through the CCN. The CCN in turn sends a CAN bus message to the Totally Integrated Power Module (TIPM) to enable the necessary drivers to set the required illumination.

Wire connectors can make intermittent contact or become corroded. Before coupling wire connectors, inspect the terminals inside the connector. Male terminals should not be bent or disengaged from the insulator. Female terminals should not be sprung open or disengaged from the insulator. Bent and sprung terminals can be repaired using needle nose pliers and pick tool. Corroded terminals appear chalky or green. Corroded terminals should be replaced to avoid recurrence of the problem symptoms.

Check fuses in the TIPM to be sure there they are not damaged or blown. Using the diagnostic tool, actuate the exterior lighting and proceed with the appropriate diagnostics.

AUTOMATIC HEADLAMP SYSTEM


The Automatic Headlamp system turns the instrumentation and exterior illumination lamps ON when the ambient light levels are Night and the engine is running, and OFF when light levels are Day.

DAYTIME RUNNING LAMPS


Operating the high-beam headlamps at reduced power provides daytime running lamps, which are required on all new Canadian vehicles. Daytime running lamps are functional when the engine is running and the gear selector is in any other position than in park.

HEADLAMPS ON WITH WINDSHIELD WIPERS


For vehicles equipped with the Automatic Headlamp System, the instrumentation and exterior illumination lamps will be turned ON when the headlamp switch is in the AUTO position, the engine running and the windshield wipers have been in the intermittent, low or high mode of operation for more than ten seconds. When the windshield wipers are turned OFF, the TIPM will determine if the instrumentation and exterior illumination lamps should remain ON base upon the current ambient light level.

HEADLAMP SYSTEM


The operation of the exterior lighting is controlled by the TIPM. The CCN determines the lighting configuration as a result of the inputs from the ignition switch, headlamp switch and multi-function switch, brake switch, switch bank and ambient light sensor. A CAN-I HS bus message is transmitted from the CCN to the TIPM to enable the necessary drivers to set the illumination configuration. There is hard wiring connected between the headlamp switch and the CCN. The first wire contains information regarding the position of the headlamp switch (Off, Automatic Headlamps, Automatic Headlamp switch fog, Park with Fog, Head, or Head with Fog Lamps). The second wire contains information regarding the position of the dimmer switch (Dome Lamp, Daytime Brightness, Dimming Level or Off). The third wire is a dedicated signal return (ground) wire. The fourth wire provides power to the front fog lamp indicator.

HEADLAMP TIME DELAY SYSTEM


The TIPM controls the Headlamp Delay Feature using inputs for the Ignition key position, headlamp switch position, and a configured time setting. Turning off the headlamps after turning off the ignition will enable this feature to keep the headlamps on for a programmable amount of time.