OBD-II Fault Code

C1263: Lamp Warning Relay Circuit Open

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for C1263.

System family

Chassis

Manufacturer-specific

Repair category

Lighting

Use this category to narrow your checks before replacing parts.

Severity

Medium

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What C1263 usually means

Lamp Warning Relay Circuit Open.

Common symptoms

ABS/traction/steering/suspension warning lamp or abnormal chassis behaviour

Likely causes

Blown bulb/LED module; Poor ground; Fuse/relay fault; Switch/module/wiring issue; Open circuit; Disconnected connector; Broken wire; Failed component

Diagnostic checks

Inspect wheel/brake/suspension area, connectors, sensor wiring and module power/ground; Check bulb/module, fuse, ground and connector corrosion; Check connector fitment and continuity from module to component

Repair guidance

Replace failed bulb/module, repair ground/wiring, replace switch/relay if confirmed; Repair open wire/connector or replace the failed component after continuity test

Verification after repair

Clear code, road-test safely at low speed first, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.