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Has no flasher ! Lighting Control Module
This vehicle uses a lighting control module (LCM). This eliminates the electronic interference and heat associated with the thermo-electric devices used previously. The LCM:
Is a microprocessor based module that controls several vehicle subsystems.
Responds to electrical input signals from various switches, sensors, and external modules.
Is located on the LH side of the instrument panel.
Subsystem functions include:
Headlamps with autolamps.
Turn signal lamps/hazard flasher lamps.
Daytime running lamps (DRL) (Canada only).
Interfaces with the driver door module (DDM) via SCP for illuminated entry
Inspection and Verification
Verify the customer concern by operating the turn signal/cornering/hazard lamps.
Visually inspect for obvious signs of mechanical and electrical damage; refer to the following chart:
Visual Inspection Chart
Damaged wiring harness
Loose or corroded connection
Turn signal/hazard bulb(s)
Lighting control module (LCM)
If the inspection reveals obvious concern(s) that can be readily identified, repair as required.
If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
check that the program card is properly installed.
check the connections to the vehicle.
check the ignition switch position.
If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
Perform the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00 .
NO RESP/NOT EQUIP for lighting control module (LCM), go to Pinpoint Test A.
SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the LCM.
If the DTCs retrieved are related to the concern, go to the LCM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.
Lighting control module ? ?????? Hazard / flasher module ! Now ( there''s not even an electrical signal where the fuse plugs into the interior fuse panel.) What FUSE ??????
The STOP LP 25 A fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the STOP 15 A fuse and the CHMSL 10 A fuse in the I/P fuse block, and to the turn signal/hazard module. The turn signal/hazard module then supplies voltage to both of the trailer rear turn/stop lamp supply voltage circuits. The voltage from the CHMSL 10 A fuse is to the center high mounted stop lamp (CHMSL) and the trailer jumper harness. The voltage from the STOP 15 A fuse is to the stop lamps, throttle actuator control (TAC) module, and the cruise control.
The backup lamp request signal is sent from the powertrain control module (PCM) to the body control module (BCM) on the Class 2 message system. This signal is based on the park neutral position (PNP) switch signal. The BCM supplies voltage on the backup lamp supply voltage circuit to the backup lamps and to the automatic day/night mirror. Voltage for the courtesy lamp supply voltage circuit and backup lamp supply voltage circuit is from the TBC B fuse in the instrument panel fuse block directly through the BCM to these circuits. A short to ground on either of these circuits will open the fuse. The backup lamps are grounded at G401.
For trailer wiring, a separate backup lamp circuit is connected through the underhood fuse block from the TRLR B/U 10 A fuse to the trailer wiring harness.
Turn Signal/Hazard Lamps
The IGN E 10 A fuse in the underhood fuse block supplies battery positive voltage to the turn signal/hazard switch assembly. The FLASH 25 A fuse in the I/P fuse block supplies battery positive voltage to the turn signal/flasher module and ground is supplied at G200. When the turn signal switch is placed in either the left or right position, a voltage signal is completed from the turn signal switch to the turn sign/flasher module. When the hazard flasher switch is activated, a ground signal is completed from the turn signal/hazard switch to the turn sign/flasher module. The turn sign/flasher module then sends an on-off voltage signal through the LT TRLR, RT TRLR, LT TURN or RT TURN 10 A fuses in the I/P fuse block to the appropriate turn signal or to all 4 fuses for hazard operation. The instrument panel cluster (IPC) indicators receive voltage from the LT TURN and RT TURN fuses as well as the DDM/PDM for the mirror turn signals. The DDM/PDM has no function or control of the mirror turn signals other that a pass through connection for the circuits. The audio chime is also activated when the turn signals are on. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G100. The rear turn signals are grounded at G401. The Mirror turn signals are grounded by the DDM/PDM.
Do you know how to do automotive electrical circuit testing with a test light or volt meter ? How to read an use a wiring diagram to pin point testing points . ( connectors , fuse locations etc... ) How to use a power flow chart ? Here is a site for just such info .
Without knowing the year, I'll guess that it's newer than 1998. The turn signals aren't controlled by a flasher. They are controlled by the lighting control module. It's located under the dash, driver's side, just about behind the ash tray. It's held in by 7mm nuts and 2 plastic tabs. Hope I've helped. If so, please rate my assistance and leave a comment.
In the event it's older than a '98 and isn't controlled by the module. Turn on the emergency flashers and follow the clicking. That will lead you to the fuse box where you will find a round "DOT 3" fuse/relay.
Do u have a 4,5,6,or 7 way (wire) system? If it's 4 way it allows basic hookup for 3 lighting functions: GREEN is right turn signal and stop light, YELLOW is left turn signal and stop light, BROWN is license, and side marker lights, WHITE is ground.
5way is same as above, but adds a BLUE wire for brake signal or aux. power. Its used on pop up campers, utility and boat trailers.
6way (rectangle plug) green=right turn signal, yellow=left turn signal, brown=taillight, white=ground, red and blue can be used for brake control or auxilary. Used on small motorcycle trailers, snowmobile trailers, utility trailers.
6way Round Plug, same as above, but blue is electric brakes, and black (sometimes red,) 12v; note:sometimes red/black need to be reversed w/ blue to suit the trailer.
7way adds an additional pin at plug in for 12volt power or back up lights. Whoa! hope that answers your question w/out confusing u. Let me know if u need more info.