Wiring diagram for auto lamp chicago 9000 turn signal

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Do you know how to test automotive electrical circuits using a DVOM - digital volt ohmmeter ? Looking at a wiring diagram to see what all is involved in making the right turn signal work ? Free wiring diagrams here http://www.bbbind.com/free-tsb/ Enter vehicle info. Year , make , model an engine size . Under system click on lighting ,then under subsystem click on turn signal lamps . Click the search button then the blue link . Looking at the diagram for the turn signals i see the turn signal switch is a input to the BCM - body control module . The turn signals are controlled by the BCM . Having a professional scan tool to check input data to the BCM an out put control for the turn lamps on the right side would save time .
https://www.youtube.com/watch?v=YaYtCVBodpw&t=98s

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• The driver door module (DDM) provides a low reference for the left outside rearview mirror turn signal
• The front passenger door module (FPDM) provides a low reference for the right outside rearview mirror turn signal

Looking at wiring diagrams for the systems with the problem to see if they share a common power supply or ground connection . Sounds like loose connection . Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohmmeter to test electrical circuit's . Free wiring diagrams here http://www.bbbind.com/free-tsb/ Enter vehicle info. year , make , model an engine size .
The body control system consists of the body control module (BCM) and its associated controls. Battery positive voltage is provided to the BCM from the TURN/HAZ fuse and the CHMSL/BKUP fuse in the fuse block instrument panel (I/P). The module grounds are wired to ground G200, G201 and G301. The BCM is wired to the class 2 serial data communication bus as well as discrete input and output terminals to control the functions of the vehicles body .
Cruise Control Inoperative/Malfunctioning
Circuit/System Description
The cruise control switch is an input to the engine control module (ECM) / powertrain control module (PCM). The ECM (5.3L) / PCM (3.8L) monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when a cruise control function has been requested. The ECM detects a specific voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit when a cruise control function switch is activated, with each switch having a different predetermined voltage value.
Turn Signal Lamps
The STOP/TURN/HAZARD fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the LEFT TURN or RIGHT TURN position, ground is applied from G202 through the turn switch, to the turn signal switch signal circuit and to the BCM. The BCM then applies battery positive voltage to front and rear turn signal lamps supply voltage circuits. The left front turn signal lamp is grounded at G100, right front at G101, left rear at G301 and the right rear is at G302.
Stop Lamps
The turn signal lamps are also used as stop lamps. The STOP/TURN/HAZARD fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the stop lamps.
A 10-volt reference signal and a low reference signal is applied from the BCM to the brake pedal position (BPP) sensor. When the brake pedal is applied, the BPP sensor applies a signal to the BPP sensor signal circuit to the BCM. The BCM then applies battery positive voltage to the LR and RR stop/tail/turn lamps through the LR and RR stop/turn lamps supply voltage circuit. The BCM also supplies a battery positive voltage to the CHMSL through the stop lamp supply voltage circuit. The ground for the LR stop/tail/turn lamp is supplied from G301 The ground for the RR stop/tail/turn lamp and for the CHMSL is supplied from G302.

Having the vehicle checked for DTC'S - diagnostic trouble code's mite help . Not at auto zone or advance etc... they can not read BCM codes .

Fuse blow's , short to ground in that circuit somewhere . Viewing wiring diagrams ,so you know which wire's to test using a DVOM - digital volt ohm meter . Or a special short finder tool is how you find the problem . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on lighting ,then under subsystem click on turn signal lamp . Click the search button then the blue links.
How to find automotive electrical shorts

Principles of Operation
The lighting control module (LCM) controls the flashing of the turn signal and hazard lamps. Power is routed through the multifunction switch to the LCM. When the multifunction switch is placed in the LH turn, RH turn or hazard lamps ON position, the LCM will command those lamps on and off.

have it checked for DTC'S diagnostic trouble codes
B1873 Turn Signal/Hazard Power Feed Short to Ground LCM Go To Pinpoint Test O .

Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on lighting , then under subsystem click turn signal lamps .Click the search button , then click on the blue link . The whole wiring diagram for the turn signals will be yours to view .

In the diagram for rear lamp, the top wires are voltage, the bottom black wire is ground. The brown wire on either side should be tail lamps, goes hot when you turn on the headlamp switch. The other top wire on either should be for turn signal. With everything turned on, is there voltage on that wire?
Because the front works and the rear don't, possible wiring circuit problem? The voltage for turn signals comes from bcm. The bcm knows when you turn on turn signal switch, either side, then the bcm sends voltage to turn signal lamp at the rear and front.

Your problem is not a fuse if just the right front isn't working , same for all indicators .
Turn Signal Lamps
The TURN fuse in the fuse block - I/P provides ignition positive voltage to the turn signal relay. The turn signal lamps may only be activated with the ignition switch in the ON position. When the turn signal switch is placed in either the left or right position, current flow is from the turn signal relay output to the turn signal switch assembly. The turn signal relay sends an ON-OFF voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator through the turn signal switch.

an it's not a bad relay , if there is no B+ voltage at the lamp you have an open circuit . You would need a wiring diagram to test circuit from turn lamp back to source voltage to find open . free wiring diagrams at www.bbbind.com . video on youtube testing voltage drop Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

There is an issue, you have a dead short in the circuit, no quick fix for this. You must first get a wiring diagram of the entire circuit and then follow it until you locate the shorted wire or component.

Go to http://www.bbbind.com/free_tsb.html free wiring diagrams ! You having tail light problems ? Do you know how they work ?

They are turned on by the BCM !
Park, Tail, Marker and License Lamps
The park, tail, license, and marker lamps are turned ON when the headlamp switch is placed in either the HEAD or PARK lamp positions, or anytime the automatic light control (ALC) turns the headlamps ON. When the headlamp switch is placed in the park lamp or headlamp positions, ground from G202 is applied through the signal circuit to the BCM indicating the park lamp request. In response to this signal, the BCM applies ground through the park lamp relay control circuit energizing the PARK LP PCB Relay. With the relay energized, battery voltage is applied through the switch side of the relay, both park lamp fuses, and the supply voltage circuits illuminating the park, tail marker, and license lamps. Ground for the left front park and marker lamps is provided at G101 and the right front park and marker lamps at G100. Ground for all rear lamps is provided at G302.
Turn Signal Lamps
The LT T/SIG and RT T/SIG fuses located in the underhood fuse block supplies battery positive voltage to the body control module (BCM) for turn signal and hazard lamp operation. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G202 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. The BCM also sends a message via GMLAN to the instrument panel cluster (IPC) to cycle the turn signal indicator ON and OFF depending on the position of the turn signal switch.
Ground for the turn signal lamps is supplied as follows:
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G101 provides ground for the left front turn signal lamp

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G100 provides ground for the right front turn signal lamp

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G302 provides ground for the left and right rear turn signal lamps

here is a wiring diagram. Are the bulbs for sure good?


hope you can read it.

I'm assuming you're just going to splice into the tail light wiring so that's what these wire colors are:
at the tail lamp 3 way connector:
black and yellow = park lamp
dark green and brown = left turn signal
there should be another connector with violet and black wire for reverse lights.
the stop lights are turned on through the turn signal circuits.