Code
P1628
DAEWOO
P — Powertrain
Vaporize lamp mal
Views:
UK: 3
EN: 7
RU: 9
AI status
Completed
Completed
100%
Causes
- Burnt or failed lamp/bulb
- Blown fuse or faulty relay supplying the lamp
- Open, shorted or damaged wiring harness to the lamp
- Corroded or loose lamp socket or connector pins
- Poor or missing ground at the lamp circuit
- Faulty lamp control output in the ECU or body control module
Symptoms
- Vaporizer lamp does not illuminate when it should
- Lamp illuminated continuously or stuck on
- Intermittent lamp operation (flicker or works after moving harness)
- Related dashboard indicator behaviour (reduced/misleading illumination)
- Possible stored manufacturer code(s) and MIL illumination depending on vehicle
What to check
- Visually inspect the lamp, socket and wiring for damage, corrosion or water intrusion
- Check related fuses and relays; replace if blown or suspect
- With ignition on, measure voltage at the lamp connector for battery voltage presence
- Check continuity and resistance of the lamp filament or LED module per manufacturer spec
- Inspect ground connection continuity from lamp to chassis (low ohms expected)
- Use a scan tool to read manufacturer data, confirm P1628 stored and look for additional related codes
Signal parameters
- Lamp supply voltage: ~12 V with ignition on (verify actual vehicle spec)
- Ground continuity: near 0 Ω between lamp ground terminal and chassis
- Lamp filament/LED module resistance: manufacturer-specific (typical incandescent low ohms; LEDs may require module testing)
- Control output: ON = battery voltage or PWM; OFF = near 0 V (check with scope or multimeter)
- Lamp current draw: typically tens to a few hundred mA for incandescent bulbs; LEDs lower — compare to spec
Diagnostic algorithm
- Confirm P1628 is stored and note freeze-frame/conditions using a scan tool. Check for additional DTCs.
- Verify symptom: observe lamp operation with ignition and while exercising related functions.
- Inspect lamp assembly, lens, socket and wiring harness for corrosion, damage, loose pins or water ingress. Repair as needed.
- Check fuses and relays in the fused distribution box related to instrument/circuit lighting. Replace any blown fuses and re-test.
- Measure supply voltage at the lamp connector with connector disconnected and ignition on; expect ~battery voltage. If no voltage, trace back to fuse/relay/ECU.
- Check ground continuity from lamp ground to chassis; repair poor ground connections.
- Measure resistance or current draw of the lamp (or verify LED module function). Replace lamp if out of specification.
- If wiring and lamp check good, back-probe control output from ECU/body module while commanding lamp (or activating system) to verify correct switching behavior. Use oscilloscope if PWM suspected.
- Repair or replace damaged wiring, connector, lamp, fuse, relay or module as indicated by tests.
- Clear codes, re-check readiness, and perform a functional test/road test to confirm repair. If intermittent or module failure suspected, consider module programming or replacement per manufacturer guidance.
Likely causes
- Failed lamp or LED module
- Blown fuse or faulty relay feeding the lamp circuit
- Damaged wiring or corroded connector at the lamp
- Poor ground connection at lamp or body sheet metal
Fault status
Status
Vaporizer lamp malfunction detected (circuit or lamp fault). Check lamp, fuse/relay, wiring and control module output.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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