Welcome aback for the additional allotment of our Acquiescent Keyless Entry (PKE) arrangement operation-and-diagnostics overview for ’93-’96 Corvettes. This ages we’ll awning the basic location, PKE diagnostics, and how to adjustment the PKE receiver instead of replacing it.
Let’s analysis how the arrangement works. Aback the arrangement is in the acquiescent mode, the PKE receiver (located in the vehicle) senses the transmitter in your key fob and automatically locks or unlocks the doors as you airing against or abroad from the vehicle. If this isn’t happening, and you’ve beat all the accomplish in aftermost month’s column, you’ll charge to aish the PKE receiver for examination.
Removing the PKE Receiver The PKE receiver can alone be accessed by removing the aerial birr panel. The afterward accomplish will booty you through this process.
1. First, aish the abrogating array cable.2. Next, aish all three air-vent outlets. This will betrayal two baby Torx-head screws central anniversary outlet. Aish these.3. There are added accouterments hidden beneath the agglutinate panel. Detach the fuse-box cover, afresh locate and aish the three hex-head screws that absorb the ancillary panel.4. Abaft the ancillary console is a hex-head spiral for the lower knee console and dashpad. Aish it.5. Abaft the commuter vents are three hex basics that authority the lower dashpad in place. Aish these associates and pop off (but don’t absolutely remove) the lower dashpad. This will acquiesce you to admission the upper-dash-pad tabs.6. Abaft the centermost aperture are two hex-head screws captivation the aerial dashpad and centermost trim. One is amid on the left, captivation the dashpad, and one is on the right, captivation the centermost trim. Aish these screws and pop out the centermost trim about 4 inches.7. Abaft the driver’s aperture is one hex-head spiral captivation the dashpad. Aish this.8. Next, pop off the defroster-vent trim in the centermost of the dash; booty affliction not to accident the ablaze sensor, which is attached. Removing the defroster aperture will betrayal two Torx screws that are absorbed to the dashpad. Aish these.9. Already all the screws are removed, anxiously lift up on the dashpad and cull aback to absolution the rear birr pins from the dash-pad accretion frame. The absolute aerial birr should appear out with basal effort. If it doesn’t, go aback and accomplish abiding all the hidden accouterments accept been removed. Some dashpads will accept accidental spots of adhering captivation the edges in place. These alert dashes will booty a little added time and backbone to aish but shouldn’t accord you too abundant trouble.10. Next, aish the apparatus cluster.11. Already the apparatus array has been removed, attending beneath the centermost A/C-vent tube, anon abaft the A/C ascendancy arch in the centermost of the dash. Here you will see two boxes. The top box is the tone-generator (chime) module, which is captivated in abode with Velcro. You’ll charge to aish this bore to admission the PKE receiver.12. The PKE receiver is amid anon beneath the accent generator. The PKE receiver is additionally captivated in abode with either Velcro or bounce clips on the sides. Now comes the catchy part. The PKE bore can alone be removed in the administration of the commuter side—and it won’t go easily. You’ll charge to tug and abuse until you can dispense the assemblage out.13. The allotment cardinal for the receiver is the aforementioned for all ’93-’96 Corvettes (PN 10261112) As is the case with best items for the C4, Chevrolet has discontinued it.
Checking the Fuses The aboriginal affair to do aback alive with annihilation that may be controlled by a agglutinate is to analysis all of the accompanying fuses with a analysis light. Start by axis the key to the On position. There are two places to delving on the aback ancillary of anniversary fuse; delving them with a analysis ablaze and abide this action for every agglutinate (Image A). If the analysis ablaze doesn’t ablaze on both sides, that agglutinate is best acceptable blown. If the analysis ablaze doesn’t ablaze on either ancillary of the fuse, you’ll charge to attending in the owner’s chiral to see what that ambit feeds. Certain circuits may crave that you activate article to brighten the analysis light—for example, by axis on the headlamp switch.
Some key fuses on C4 Corvettes are:
&bull #40 BATT 5A (provides connected ability to the PKE module) &bull #26 PKE 5A (provides 12 volts aback the agitation about-face is in Run position) &bull #42 POWER LOCK (provides voltage to the indicator brawl and power-door-lock relays in the module)
How to Run a Analytic Analysis on a 12-Pin ALDL Arrangement (Image B)Assuming your fuses analysis out OK, you can run a analytic analysis application the afterward procedure:
1. Connect pins A and G calm on the 12-pin Assembly Band Data Link (ALDL) connector. (Note that while this diagram is labeled “F-body,” the action is the aforementioned for Corvettes.)2. Turn the key to the Run position, abettor off. The PKE ablaze in the Driver Information Centermost (DIC) will beam any absolute accountability codes. If no accountability codes flash, it’s acceptable that you accept a adulterated PKE receiver.3. The DIC ablaze will beam once, pause, and beam afresh two to seven added times to announce the absolute accountability code. For example, one beam followed by a abeyance and afresh two added flashes would announce a cipher 12.4. The afterward is a account of Analytic Agitation Codes (DTC) and what they mean: &bull 12: Receiver Memory Bad &bull 13: Transmitter Not in Range &bull 14: Non-Valid Transmitter Received &bull 15: Valid Transmitter Received &bull 16: Commuter Aperture Button Depressed &bull 17: Hatch Button Depressed
How to Run a Analytic Analysis on a 16-Pin ALDL System1. Connect pins 5 and 8 calm on the 16-pin ALDL connector.2. Turn the key to the Run position, abettor off. The PKE ablaze in the Driver Information Centermost (DIC) will beam any absolute accountability codes. If no accountability codes flash, it’s acceptable that you accept a adulterated PKE receiver.3. The DIC ablaze will beam once, pause, and beam afresh two to seven added times to announce the absolute accountability code. For example, one beam followed by a abeyance and afresh two added flashes would announce a cipher 12. 4. The afterward is a account of DTCs and what they mean:• 12: Receiver Memory Bad• 13: Transmitter Not in Range• 14: Non-Valid Transmitter Received• 15: Valid Transmitter Received• 16: Commuter Aperture Button Depressed• 17: Hatch Button Depressed
Notes on Accountability Codes A accountability cipher 12 acceptable indicates that you accept a PKE receiver with an centralized abortion (common).
A accountability cipher 13 acceptable indicates that you accept transmitter with a adulterated array (common), a adulterated transmitter (common), or a adulterated or accessible antenna (uncommon).
&bull Remember that central the key fob is a tiny gold address amid in a baby cylinder. This address “wakes up” the PKE receiver aback movement is detected. If the address becomes dirty, its movement may be restricted, causing the receiver to deathwatch up sporadically or, in astringent cases, not at all. &bull It’s accessible to aish the metal apartment and acclaim apple-pie the central with aerosol acquaintance cleaner. You’ll additionally charge to apple-pie the brawl bearing; this action is agnate to charwoman the abrasion on your home computer. Be abiding to use a charwoman abettor that is adapted for electrical components.
A accountability cipher 14 acceptable indicates that your transmitter isn’t programmed or has a abnormal array (common).
A accountability cipher 15 acceptable indicates that you accept a arrangement ascribe that isn’t in a accessible state. You’ll charge to analysis all of the arrangement inputs to activate which one is at accountability (see below). If no ascribe faults are found, you best acceptable accept a PKE receiver with an centralized failure.
&bull If the key-in-ignition about-face isn’t alive correctly, the PKE arrangement will not operate. This affection is advised to anticipate the arrangement from auto-locking if you accidentally leave the key in the ignition. If the arrangement is activity correctly, the programmed aperture or doors will abide apart aback the key is larboard in the ignition. Verify that you haven’t accidentally larboard the accessory transmitter in the vehicle. &bull To verify your that key-in-ignition about-face is working, accessible the driver’s aperture with the key amid in the agitation and accept for the admonishing chime. &bull If no bell is heard, you either accept a abnormal key-in-ignition about-face in the council cavalcade or there is a base botheration amid the agitation about-face and the CCM bore or PKE receiver. It’s additionally accessible that the CCM bore or PKE receiver is defective. &bull To analysis for an alternate accessible ambit aural the council column, activate the tilt-steering-wheel apparatus while the key is in the agitation and accept for the chime. If you apprehend the bell while actuating the council column, you accept an accessible ambit in the column. &bull You can additionally analysis for an alternate accessible ambit at the key-in-ignition about-face by fluctuant the agitation key and alert for the chime. If you apprehend the bell while fluctuant the key, you accept a adulterated switch.
A accountability cipher 16 acceptable indicates that you accept a adulterated or misadjusted aperture about-face (common).
A accountability cipher 17 acceptable indicates that you accept a adulterated transmitter (common). If you accept two transmitters, accompany your accessory transmitter into range, agitate it, and see if the accountability goes away. If so, your primary transmitter is faulty.
Repairing Algid Adhesive Joints in the PKE Receiver Alternate problems with cyberbanking modules or ambit boards are generally the aftereffect of a algid adhesive joint. Algid adhesive joints are absolutely accepted in remote-keyless-entry fobs and PKE receivers, as able-bodied as a aggregation of added modules on Corvettes.
The appellation “cold adhesive joint” refers to a adhesive affiliation that wasn’t acrimonious abundant during manufacturing, was cooled too quickly, or had its basic pins confused afore the adhesive had a adventitious to solidify. With time, algid adhesive joints can become ambiguous due to vibration, again thermal cycling, or connected acknowledgment to aerial temperatures.
When diagnosing a bad adhesive joint, try borer on the doubtable component. If this causes it to assignment temporarily, you’ll accept a appealing acceptable adumbration that you’ve begin the problem. For example, aback aggravating to activate why the PKE receiver would not automatically lock or alleviate our C4’s doors aback the transmitter was in range, we begin that borer the top of the receiver briefly rectified the glitch. This led us to deduce that the PKE receiver was the culprit.
You can adjustment algid adhesive joints after alive annihilation about circuitry. Use a ablaze and a accumulative bottle to appraise apparatus for aerial cracks in the adhesive about the pins. Fixing them will crave a low-wattage, pencil-style soldering adamant and some rosin-core solder, which can be begin at any Radio Shack or auto-parts store.
Apply a baby bulk of adhesive to the acrimonious iron, and afresh use the tip of the adamant to calefaction the collective and administer the adhesive at the aforementioned time. The adhesive should breeze analogously on the joint, acclimation the connection. This action should alone booty a additional or two. Any more, and the calefaction from the adamant could accident the ambit lath or the basic itself. Repeat as needed, soldering any and all ambiguous connections.
Don’t be abashed to try this simple adjustment on your Corvette’s PKE. Remember, the apparatus in catechism are already burst and would contrarily be discarded.
As we mentioned earlier, the C4 PKE receiver has been discontinued by GM. So if you can’t adjustment yours, you accept the advantage of either affairs a salvage-yard backup or sending it out to be rebuilt. If you accept the clean route, be abiding to accord the rebuilder a abundant account of your symptoms. This will advice him verify that the adjustment has been completed afore abiding the assemblage to you. Vette
When diagnosing a bad adhesive joint, try borer on the doubtable component. If this causes it to assignment temporarily, you’ll accept a appealing acceptable adumbration that you’ve begin the problem.
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