interior lights

[jcweis1]

2005 Bonneville interior lights will either stay on while driving or will come on and off. The lights will go off in time after parked. I replaced the light fixture control switch from a donor car and it did not help. Please can anyone help me figure this out ?
thanks

[jcweis1]

Anyone with suggestion on what to look for ?

[nos4blood70]

The car might think that the door isn't closed? Do you have any other chimes or messages?

[jcweis1]

no other indicators that the car thinks the door is open - no chimes or messages

thanks for helping

[jcweis1]

any help with this would be appreciated

[Archon]

There are various things that can cause the problem. As there is no indication of an open door, it would seem that the door modules and switches are not the problem. You could start by disconnecting the switch to manually turn on the lights, to see if that helps. If not, remove the interior lamps relay. If the lights stay off, see if there is a relay with the same number, and swap them. Other than those things, it could be a problem with the rear integration module, or an intermittent short to ground.

This is a description of the associated circuits.

BATTERY RUNDOWN PROTECTION
Power is supplied to the courtesy lamps, reading lamps, rear compartment lamp, vanity lamps and IP compartment lamp by the interior lamps relay. This relay provides parasitic load protection and is activated by the rear integration module (RIM) when conditions are right to activate any interior lamp. The RIM will keep this relay active for 10 minutes following the key being turned OFF and retained accessory power (RAP) being deactivated or timed out. The 10 minutes is reduced to 3 minutes if mileage is less then 22.5 KM (14 miles) .

INTERIOR LAMP SWITCH
When the interior lamp switch is placed in the ON position the instrument panel module (IPM) Interior Lamp Switch Input is grounded through the interior lamp switch. When the interior lamp switch is placed in the OFF position the IPM Interior Lamp Switch Input is left open.

The IPM sends a class 2 message to the RIM indicating the state of the interior lamp switch. The RIM then controls the activation and deactivation of the courtesy lamps based on other inputs.

DOOR ACTIVATED COURTESY LIGHTING
The interior lamp switch must be in the OFF position. When LF, RR or LR door is opened the appropriate door ajar switch contacts close. The door module sends a SBI message to the drivers door module (DDM) indicating that the door is open. The drivers door module sends a class 2 message to the RIM indicating that a door is open. If the twilight light sensor indicates night time conditions, the RIM will activate the interior lamps relay and activates a Pulse Width Modulated ground which provides a ground to the lamps. The interior lamps relay supplies power to all interior courtesy lighting.

The RIM will continue to keep the active courtesy lamps on for 25 seconds after the last door is closed. The courtesy lamps will turn off immediately if any of the KEY is turned to the RUN position or the power door locks are activated.

KEYLESS ENTRY INTERIOR ILLUMINATION
When the remote function actuator (RFA) module receives a door unlock command from the RFA transmitter the RFA will send a class 2 message to the RIM indicating that a remote function actuator command was received. In response to the message and if the twilight sensor indicates night time conditions the RIM will activate the interior lamps relay and activates a Pulse Width Modulated ground which provides a ground to the lamps. The interior lamps relay supplies power to all interior courtesy lighting. The RIM will keep the courtesy lamps on for 40 seconds The courtesy lamps will turn off immediately if the Key is turned to the RUN position, or an all doors lock command is issued with all doors closed. Refer to Keyless Entry System Description in Keyless Entry.

INTERIOR LAMPS
Power is supplied to the courtesy lamps, reading lamps, rear compartment lamp, vanity lamps and IP compartment lamp by the interior lamps relay. Battery voltage is supplied at all times from the fuse in the rear fuse block to the interior lamps relay. When conditions are right to activate any interior lamps the RIM grounds the interior lamps relay. The coil is energized closing the switch contacts. Battery Voltage is then supplied to all interior lamps. The RIM activates a Pulse Width Modulated ground which provides a ground to the lamps. The interior lamps relay supplies power to all interior courtesy lighting.

[jcweis1]

thanks that will really help

[jcweis1]

Can you tell me where to find the interior lamps relay?

[Archon]

I believe it to be relay 51 in the rear fuse block.

[jcweis1]

Thank you that really helps Will try changing that out and let you know