P1634

Code

DAEWOO P — Powertrain

Cruise lamp fault

Brand: DAEWOO

Type: P — Powertrain

Views: UK: 4 EN: 17 RU: 4

AI status

Completed

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Page language: EN

Causes

Blown fuse for the instrument cluster or cruise lamp circuit
Burned-out or failed indicator bulb / LED
Open or short in the lamp wiring harness or connector
Poor or corroded ground or power connection to the cluster
Faulty instrument cluster lamp driver or cluster electronics
Body/BCM or ECU communication/software error (CAN/BUS related)

Symptoms

Cruise control indicator lamp does not light when cruise is enabled
Indicator lamp stuck ON or flickering
Cruise control function may be disabled or show incorrect status
Related dashboard warnings or stored communication faults
Intermittent operation of other cluster lamps (possible shared circuit/ground)

What to check

Use a scan tool to read/record freeze-frame data and verify P1634 is current/repeatable
Perform an active test (if available) to command the cruise lamp on/off
Check relevant fuses for continuity and correct fuse rating
Visually inspect the instrument cluster lens/assembly and connector for damage or corrosion
Verify lamp bulb or LED integrity (visual or resistance check)
Measure voltage at the lamp connector with ignition ON and while commanding the lamp

Signal parameters

Supply voltage to lamp circuit: ~12 V with ignition ON (may be switched positive or switched ground)
Control signal: digital command from BCM/ECM or direct power/ground switch; state should change when lamp is commanded
Typical lamp current: low (LED
Bulb/LED resistance: low (a few ohms for incandescent); open circuit indicates a failed lamp
Expected behavior during active test: lamp should reliably turn ON/OFF when commanded by scan tool

Diagnostic algorithm

Verify code and record freeze-frame. Clear codes and attempt to re-create fault to confirm persistence.
Visually inspect fuse(s) and replace if blown. Re-test for code presence.
Inspect instrument cluster connector and wiring for corrosion, bent pins, chafing, or damage.
Activate cruise lamp with scan tool or by operating cruise switch; observe lamp behavior.
With lamp commanded ON, measure voltage at lamp connector pin(s). If no voltage, trace back to module/fuse.
Check continuity from lamp connector to module and continuity to good ground. Repair any opens/shorts.
Remove cluster to inspect/replace the bulb/LED or test lamp socket resistance. Replace failed lamp elements.
If wiring, fuses and lamp are good, suspect cluster driver or BCM output. Check for related module communication errors (U-codes).
If necessary, swap known-good cluster or module (if available) or replace the faulty unit, then clear codes and retest.
After repair, clear codes and road/test to confirm the fault does not return.

Likely causes

Failed indicator lamp (bulb or LED) in instrument cluster
Blown fuse protecting the cluster/cruise lamp circuit
Damaged wiring (open/short to power or ground) between cluster and control module
Corroded connector or poor ground at the cluster
Internal failure of cluster lamp driver or BCM output transistor
Loss of module communication preventing lamp command

Fault status

⚠️ Status

Cruise lamp circuit fault detected — indicator may not function correctly. Possible causes include blown fuse, failed bulb/LED, wiring fault, poor ground, or instrument cluster/BCM fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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P1634 — Cruise lamp fault