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Principles of Operation
The instrument cluster and panel illumination consists of dimmable and non-dimmable illumination components. The dimmable illumination is controlled by the instrument panel dimmer switch, which allows the brightness level of the backlights to be adjusted to the customer preferences. With the parking lamps ON, the instrument panel dimmer switch uses electronic circuitry to provide a variable pulse width modulated (PWM) output to the instrument panel and all applicable switches depending on the driver-controlled level of intensity. The headlamp switch backlighting consists of 2 constantly illuminated LED bulbs that are powered by separate circuits. Battery voltage is supplied to the first bulb when the ignition switch is in the RUN position. Battery voltage is supplied to the second bulb with the parking lamps ON. The non-dimmable illumination allows for full intensity dependant on the ignition switch position.
Inspection and Verification
Verify the customer concern.
Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
Instrument panel dimmer switch
Instrument panel dimmer switch
If an obvious cause for an observed or reported concern is found, correct he cause (if possible) before proceeding to the next step.
If the cause is not visually evident, verify the symptom and GO to Symptom Chart .
The control illumination is inoperative
Go To Pinpoint Test A .
The instrument cluster illumination is inoperative
Go To Pinpoint Test B .
The climate control panel illumination is inoperative
Climate control panel
Go To Pinpoint Test C .
The audio unit illumination is inoperative
Go To Pinpoint Test D .
The transmission control lever illumination is inoperative
Transmission control lever illumination bulb
Go To Pinpoint Test E .
The hazard warning switch illumination is inoperative
Hazard warning switch
Go To Pinpoint Test F .
The traction control switch illumination is inoperative
Traction control switch
Go To Pinpoint Test G .
The window control switch illumination is inoperative
Window control switch
VERIFY the operation of the window control switch in question. If the window control switch is inoperative, REFER to Section 501-11 . If the window control switch operates correctly, INSTALL the new window control switch in question. REFER to Section 501-11 .
The instrument panel illumination does not dim
Go To Pinpoint Test H .
Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative
A variable pulse width modulated (PWM) voltage is supplied to the instrument cluster through circuit 29S-LA31 (OG/BU). The instrument cluster is grounded through circuit 91-GG14 (BK/OG).
circuit 29S-LA31 (OG/BU) open
circuit 91-GG14 (BK/OG) open
PINPOINT TEST B: THE INSTRUMENT CLUSTER ILLUMINATION IS INOPERATIVE
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
is this car the all alluminium xk model ? if so it sounds like a bad earth the earth studs are all bonded to the body and are prone to detatching from the body and causing all strange probs. the favorite ones are both front behind the wheel arch liners, if its the older xk still sounds like a bad earth poss behind the headlamps. the only other probs i had was wires coming detatched/poor connection from the column switch, hope this helps
P0234 over boost condition has occcurred. press the helpful button
The symptoms displayed for a P0234 code will depend on the cause of the overboost condition: The service engine soon or check engine light will illuminate. You will experience a loss of power. The engine may show signs of overheating. The transmission may show signs of overheating and harsh shifting. Additional codes associated with the condition set by P0234 may be present to help identify the cause. Codes are available for all electrical components utilized by the engine management computer for the control of boost levels. The engine may display signs of pre-ignition in the form of knocking. The engine may display ignition misfiring.
Read more at: http://www.obd-codes.com/p0234
You should have 12 volts at the #16 pin of the connector, if not check the fuses, it will be a fuse in the interior fuse box by the drivers under the dash, use a 12 volt test (any parts store for <$5), if the fuse is good both side of the fuse will cause the light to illuminate.
Hi, the engine light on will require you to have the engine CPU scanned for trouble code's. This can only be administered with the assistance of a diagnostic computer scan tool called OBD II. You can purchase this tool, at your local auto parts store, or you can just have the scan ran at your local auto zone parts store, free of charge. Once the diagnostic scan is administered, you will be able to isolate the issues that have caused the check engine light to illuminate which in turn is causing the car problem. This scan tool will display a print out code and the location of the issue, on the engine, as well. There are Many issues that will cause the engine light to illuminate, but the most common cause will be a failed monitoring sensor like the oxygen sensor, or sensor harness failure(separated power wire, or ground).
I've had the same type problems before and it turned out to be caused by my weakening alternator, if able to do so I would suggest, to begin ruling out causes, remove the alternator and take it to an auto parts store that offers free testing and have the test performed.
This symbol is a check engine Light which comes on when error codes are saved about problem with engine or electrics
Get an error code reader and see the problem yourself rather than pay a garage to do it .
when the MIL/SES light is turned on by the on board computer (known as the PCM) it is alerting u to the fact that a system within the electronically controlled engine fuel injection or the emission system has go out of normal opertional limits, there are over 200 such faults poss and a fault code is set in the memory of the computer when the light was turned on, u will need to have the OBD 2 electronic control system tested for the code, most Kragens and Autozone parts stores do this for free, excluding California