I have a 1992 chevy chyanne that started acting up. when i turn the head lamps on the radio and the and all interior lights go out.

STOP and PARK LPS will be tail lights.

ILLUM and GAUGES will.be dash lights.



STOP
Stop/CHMSL, Stoplamps

GAUGES
IP Cluster, DRL Relay, DRL Module, HDLP Switch, Keyless Entry Illumination, Low Coolant Module, CHIME Module, DRAB Module

PARK LPS
License Plate Lamp, Parking Lamps, Taillamps, Front Sidemarkers, Glove Box Ashtray

ILLUM
LP Cluster, HVAC Controls, RR HVAC Controls, IP Switches, Radio Illumination, Door Switch Illumination

ARE YOU PARKED KEY OR KEY ON RUNNING.
SEE QUOTE PAGE32.
READ THE USERS GUIDE FREE IN THE GLOVE BOX
MINE 2010, DAY 1, I SET ALL LAMPS INSIDE TO DISABLED
THAT WAY NEVER COME BACK TO CAR WITH DEAD BATTERY NOW FOR 12 YEARS NOW, BY MY ACTS.
BUT MANUALS SWITCHES DO WORK.
This gets tricky with 3 switches in the car ,mine , 2 dome
and one on the head lamp lever.
even opening doors on mine, no dome lamp, by may settings, in the manual.
car run perfectly day or night ,correct?
one can say manual 2ways.]
at lever /button on dome.
or open any door is a manual act,
I disable every one allowed, by my needs. cover how in the guide
NO LED upgrades correct.?
mine the dome switches are on, off , auto, so I use off, and they never come on. ever.
on yours it is different PAGE 32 USERS GUIDE QUOTES,
"To protect the battery, the interior lights will
turn off automatically 15 minutes after the
ignition is moved to the LOCK position.
THIS SAVES BATTERY IF THEY FAIL.(MY COMMENT)
"This
will occur if the interior lights were switched
on manually or are on because a door is open.
This includes the glove compartment light
and the cargo area light.
To restore interior
light operation, either place the ignition in
the ON/RUN position or cycle the light
switch."

THIS IS A SUPER GOOD FEATURE,.
WRECKING $175 BATTERY IS NOT. CHEAP OR EVER FUN.

Are these the lamps not working?

Interior Lamps Dimming
The second group of interior lighting includes lamps which may be dimmed. This group uses a combination of class 2 controlled illumination and incandescent lamps:
• Ashtray lamp
• Door switches and window switches
• Fog lamp switch
• HVAC control head assembly
• Outside rear view mirror switches
• Radio
• Steering wheel controls
• Instrument panel cluster (IPC)
• Traction control switch
• Headlamp switch
• Hazard switch
• Heated seat switch
• The rear view mirror lamps
• Surveillance mode switch (SEO, 9C1/9C3)
The RH instrument panel (I/P) fuse block supplies battery positive voltage to both the coil and normally open switch contacts of the park lamp relay. When the body control module (BCM) energizes the park lamp relay, current flows from the park lamp relay switched contacts through the REAR PARK LP fuse to the I/P dimming switch. When dimming is selected, by moving the I/P dimming switch, all incandescent back lighting lamps (see schematics) and the BCM are provided with a variable voltage through the instrument panel lamp supply voltage #1 circuit. The incandescent back lighting lamps are then grounded at G201, G203 and G302. The BCM then applies a message signal to the class 2 circuit to the IPC and radio. The class 2 displays then dim to the level set by the I/P dimmer switch. When the I/P dimmer switch is moved from MIN to MAX, all class 2 displays and all incandescent back lighting respond from minimum intensity to maximum brightness.
Parade mode may be selected by manually turning on the park lamps during daylight conditions. The front park lamp circuit supplies voltage the HVAC assembly for a park lamp on input, and the display will become full bright. The BCM applies a message signal to the class 2 circuit to the IPC and radio commanding the displays to become full bright. The surveillance mode switch (SEO) overrides this feature.
Battery Rundown Protection / Inadvertent Power
The body control module (BCM) controls the lighting system through circuits that enable the park lamps, head lamps and fog lamps as well as the interior lamps. The BCM opens these enabling circuits 20 minutes after the ignition switch is turned OFF with no subsequent lamp switch activity. If the ignition switch is turned to any position other than OFF, or if a lamp switch is activated, during this 20-minute period, the timer will reset for another 20 minutes.

Dash lights an heat have nothing in common, two separate problems.

Hooking up a scan tool an checking for stored DTC'S -diagnostic trouble codes in the BCM would be first step in diagnostic procedures.

Interior Backlighting Inoperative
Step
Action
Yes
No
Schematic Reference: Interior Lights Schematics
1
Did you perform the Lighting System Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Lighting Systems
2
Turn the ignition switch to the RUN position.
Turn the door switch to the ON position.
Turn the headlamp switch to the HEAD position.
Do all of the interior lamps illuminate?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
3
Is only one lamp inoperative?
Go to Step 4
Go to Step 5
4
Repair the open or high resistance in the inoperative lamp power supply or ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring System.
Did you complete the repair?
Go to Step 6
--
5
Important: Perform the set up procedure for the body control module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
Did you complete the replacement?
Go to Step 6
--
6
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

From 2001 Chevy Venture manual:

This switch is located in the overhead console switchbank. Press the symbol on the bottom of the switch to override control of the interior lamps and turn off power to the courtesy lamps, reading lamps, visor vanity lamps (if equipped) and glove box lamp. This feature allows you to have the lamps off when any door is open. Press the top of the interior lamps override switch to turn power back on to the interior lamps. This will allow the lamps to stay on when any door is open.

bim or DIM ? the dimmer switch ! Interior Lamps
The interior lamps consists of two groups, lamps that can not be dimmed and lamps that can be dimmed. This first group consists of lamps that may not be dimmed. This includes those lamps that may be manually turned on by placing the interior lamp switch to the DOME position, or by opening a door or a compartment:
• Door courtesy lamps
• Footwell courtesy lamps
• Instrument panel (I/P) compartment lamp
• Overhead console courtesy lamps
• Reading courtesy lamps
• Rear compartment courtesy lamp
• Roof rail courtesy lamps
• Sunshade vanity mirror lamps

Interior Lamps Dimming
This group of interior lighting includes lamps which may be dimmed. This group uses a combination of class 2 controlled illumination and incandescent lamps:
• Air temperature switch
• Cigar lighter lamp
• Door switches
• Driver information center (DIC) switch
• Headlamp switch
• Head-up display (HUD) switch
• Heated seat switches
• HVAC control assembly
• Instrument panel cluster (IPC)
• Memory function switch
• Radio
• Steering wheel controls
• Window switches
For the interior lighting to be dimmed the following conditions must be met:
• A low light level has been detected by the dash integration module (DIM)
• Headlamp switch is placed in to the PARK or HEAD position
• Ignition switch is placed in the ON position
Then all class 2 displays and all incandescent back lighting will be illuminated to the level set by the instrument panel (I/P) dimmer switch. When the I/P dimmer switch is moved from MIN to MAX, all class 2 displays and all incandescent back lighting respond from minimum intensity to maximum brightness.
The DIM supplies battery positive voltage to the coil side of the PRK LP relay in the rear fuse block.
When the I/P dimmer switch is moved from MIN to MAX, then the instrument panel module (IPM), W/CJ2, or climate control panel (CCP), W/C67, applies a message to the class 2 communication circuit to the DIM. The DIM then applies a ground to the park lamp relay control circuit. This energizes the PRK LAMP relay and allows battery positive voltage to be applied through the DIMR fuse to the DIM. The DIM then illuminates the following incandescent lamps through the incandescent dimming output circuit:
• Cigar lighter lamp
• DIC Switch
• Headlamp switch
• HUD switch
• HVAC control assembly
• IPC
• Radio
• Steering wheel controls
The DIM also applies a message to the following class 2 controlled illumination components:
• Drivers door module (DDM)
• HVAC control assembly
• IPC
• Radio
The DDM will then send a message through the simple bus interface (SBI) to the RH front door module (RFDM). The door modules will then illuminate the following components through the incandescent dimming output circuit:
• Air temperature switch
• Heated seat switches (W/KA1)
• Memory function switch (W/A45)
• Power door lock switches
• Power window switches
The ground for these components are provided from the DDM and RFDM.
The following components are grounded at G200:
• Headlamp switch
• HVAC control assembly
• IPC
• Radio
• Steering wheel controls
The following components are grounded at G201:
• Cigar lighter lamp
• DIC Switch
• HUD switch

the chime actually is done with the radio. the front drivers door speaker. so if the radio works and the front left speaker works. then more then likely you have a defective door switch. located in the door jam that controls the dome light

yes there is...

normal condition lamp sensor on top of instrument panel turns lamps on and off with lighting conditions when headlamps are on dash lights are on whwn drl,s are on dash lamps are off

Please check all of your fuses,There are 2 fuses for your radio,1 to supply ignition switched power and the other is a constant power supply for the radio memory.This fuse is usally a shared fuse with other devices that need constant power such as interior lights.

Push the interior light defeat button (by the headlamp switch) 4 times in a row. Auto headlights now off. To turn feature back on, push button 4 more times or turn truck off then restart.