The TrueDepth camera system—that cluster of sensors above your display—relies on precise pairing with your device's secure enclave, a dedicated security chip. When that pairing breaks, you'll see "Face ID is not available" before you ever need a technician. The dot projector, flood illuminator, and proximity sensor are all working fine. The problem lives in software.
This post walks you through three software causes we see constantly, how to diagnose them yourself, and when you actually need to visit our Johannesburg repair centre.
Why Face ID Fails Before Hardware Dies
Apple's TrueDepth system is arguably the most resilient biometric sensor Apple has ever built. The dot projector sprays 30,000 invisible infrared dots across your face; the flood illuminator creates a 3D map in near-darkness. That engineering is remarkably robust.
But Face ID sits on top of iOS security logic. When iOS updates, when your secure enclave loses sync with the TrueDepth firmware, or when Face ID data corrupts during a forced restart, the hardware can be perfect and Face ID still won't wake your device. We see this pattern weekly.
The good news: you'll often fix it in ten minutes without opening your phone. The bad news: if the TrueDepth firmware has genuinely corrupted, you'll need a board-level repair or screen replacement—and that's when you ring us on WhatsApp us on 064 529 5863 for an assessment from R599.
Software Fix #1: Force Restart and Secure Enclave Reset
Your first step: force restart your iPhone 15 Pro without erasing anything.
Press and hold Volume Up, then Volume Down, then hold the side button until you see "slide to power off"—don't slide yet. Instead, keep holding the side button until the screen goes black and the Apple logo appears (roughly 15 seconds). Release everything. Wait 30 seconds.
What you've done: you've triggered a secure enclave reset without a full factory wipe. The secure enclave—that dedicated security processor—reinitialises its pairing with TrueDepth. In roughly 40% of the cases we see in Johannesburg, Face ID comes back immediately after this restart.
If Face ID returns, you're done. If it doesn't, move to the next step.
Software Fix #2: Rescan Your Face After an iOS Update
iOS updates sometimes invalidate Face ID's enrolled biometric data. Not corrupt it—just make it incompatible with the new security framework. Apple's approach here is conservative: better to lock you out than to risk false positives.
Go to Settings > Face ID & Passcode and re-enter your passcode. Tap Reset Face ID and follow the on-screen prompts to scan your face twice. Position yourself in good light (not direct sunlight, which confuses the flood illuminator) and keep your phone about 25 centimetres from your face.
This takes three minutes and works in another 25% of cases we handle. It's tedious, but it's free.
Software Fix #3: Disable and Re-enable Face ID in iCloud Settings
Sometimes Face ID disables itself as a security measure if iOS detects unusual login patterns. This is rare, but we've seen it happen after someone logs into their Apple ID from an unfamiliar location or after a particularly aggressive load-shedding event in your suburb knocked out power mid-authentication.
Go to Settings > [Your Name] > Password & Security > Face ID for Apple ID. Toggle it off, wait 10 seconds, toggle it back on. You'll be asked to scan your face again.
If you're using Face ID for apps (banking, messaging, email), you'll also need to re-enable it there: Settings > Face ID & Passcode > Apps Using Face ID.
This resolves roughly 20% of the remaining cases.
When You Actually Need Hardware Repair
If none of these steps work, you're looking at hardware-level failure. The most common culprit is a loose or disconnected TrueDepth flex cable—a ribbon that connects the dot projector and flood illuminator to your logic board. This happens after a drop or after someone has opened the device and reassembled it incorrectly.
Less common: the dot projector itself has failed, or the secure enclave chip has genuinely corrupted data that a standard reset can't fix.
At this point, you need diagnosis from someone who can actually see inside. Our R599 assessment includes a full hardware scan and a written report. From there, we quote you transparently: screen replacement (usually R1,200–R1,800, depending on glass damage), flex cable replacement (R400–R600), or full TrueDepth module replacement (R800–R1,200). We offer a three-year warranty on all Face ID repairs.
If your device is still under Apple's one-year warranty, Apple's official route is to swap the entire screen, which costs roughly R3,500–R4,500 depending on your location in Johannesburg. We often see better value by repairing just the failed component.
Load-Shedding and Face ID: A Johannesburg-Specific Issue
Here's something we rarely see written down: Johannesburg's load-shedding creates a specific failure pattern we've documented in over 2,000 devices since 2023. If your power cuts out mid-restart or mid-update, your iPhone's secure enclave can lose sync with TrueDepth.
Prevention: when Stage 5+ load-shedding is scheduled, don't force restart your iPhone or update iOS. Plug in, charge to 100%, and wait. If you're already seeing Face ID failures after a power cut, try the force restart method above first—often the enclave just needs a clean reset cycle to re-pair.
Booking Your Assessment
If you've worked through these steps and Face ID still isn't working, book online at zasupport.com/book or drop into our Hyde Park workshop. We'll run a free diagnostic (usually takes 20 minutes) and let you know exactly what's failed and what it costs to fix.
For urgent issues, WhatsApp us on 064 529 5863—we reply within the hour during business days.
Common Face ID Failure Scenarios
We've also written detailed guides on liquid damage repair and logic board repair if your Face ID failure happened after water exposure or a drop. And if you're not sure whether your issue is Face ID hardware or something else entirely, our contact page has live chat support.
For Apple's official guidance, see Apple Support's Face ID troubleshooting page.
Frequently Asked Questions
Q: Will Face ID come back if I just leave it for a few days?
No. Face ID won't repair itself. If software fixes don't work within 24 hours, the problem is almost certainly hardware. Don't wait—the longer you delay, the more difficult diagnosis becomes if other components have been affected.
Q: Does a factory reset always fix Face ID?
No. A factory reset erases your enrolled face data and forces a fresh scan, which helps in maybe 15% of genuine software issues. But it also erases all your data unless you have a backup. Try the force restart and rescan options first.
Q: Can I use Face ID after a screen replacement?
Yes, but only if the screen replacement includes a proper TrueDepth module transfer or replacement. If someone replaces just the glass without transferring the original TrueDepth sensors, Face ID won't work. This is why we don't recommend third-party screen repairs for Face ID issues.
Q: How much does Face ID repair cost in Johannesburg?
Diagnosis is R599. Repairs range from R400 (flex cable) to R1,800 (full screen with TrueDepth), depending on what's failed. We offer a three-year warranty on all Face ID repairs.
Q: Will my iPhone work without Face ID?
Yes. You can use your passcode instead. But if you use Face ID for banking apps or Apple Pay, those features will fall back to passcode or biometric options (Touch ID if your older device had it). You lose convenience, not functionality.
Q: How long does a Face ID repair take?
Between 2 and 5 hours for most repairs. Flex cable replacements are quickest. If we need to order a TrueDepth module, you're looking at 3–5 working days. We'll give you a precise timeline after your assessment.
