Code
B1363
ALFA ROMEO
B — Body
Ignition start circuit
AI status
Completed
Completed
100%
Causes
- Blown fuse or faulty starter relay in the ignition start circuit
- Open or shorted wiring between ignition switch, relay, starter solenoid or vehicle control module
- Corroded/loose connector or poor ground at starter, relay or battery
- Weak or discharged battery or poor battery terminal connection
- Faulty ignition switch or start button assembly
- Immobiliser/antitheft system preventing starter activation
Symptoms
- No crank when turning the key or pressing start button
- Starter motor does not engage or only clicks
- Intermittent starting or starting works after tapping relay/solenoid
- Dash warning/immobiliser lamp or start inhibit message
- Starter cranks slowly or irregularly
What to check
- Verify battery state of charge and battery terminal connections; measure battery voltage (should be ≈12.4–12.8 V at rest)
- Inspect and test starter fuses and ignition/start relays (visual and swap with known good relay if available)
- Check for corrosion, loose pins or water ingress at starter, battery, relay and switch connectors
- Measure voltage at relay coil and starter solenoid while attempting to crank
- Check ground continuity between battery negative and engine/chassis
- Scan for other DTCs (immobiliser, BCM/PCM communication faults) and read freeze frame/live data
Signal parameters
- Battery resting voltage: ~12.4–12.8 V (engine off)
- Cranking voltage: should remain above ~9.5–10.5 V under load during cranking (spec varies by model)
- Ignition/start control feed to relay coil: battery voltage present when key to START or start button pressed
- Relay coil resistance: typically a few ohms (consult model-specific values)
- Starter solenoid control terminal: near battery voltage when engaged
- Starter current draw: consult manufacturer spec; excessive draw indicates mechanical/electrical starter fault
Diagnostic algorithm
- Record conditions and any dash messages; attempt to start and note symptoms (no crank, click, intermittent).
- Measure battery voltage at rest and while attempting to crank. Recharge or replace battery if low.
- Visually inspect fuses and starter/ignition relays; replace suspect fuse/relay and retest.
- With key in START (or press start), measure voltage at relay coil input and coil output to verify the switch/PCM is commanding the relay.
- Check continuity and resistance of wiring between ignition switch/BCM, starter relay, and starter solenoid. Repair open/shorts.
- Check grounds: measure resistance from battery negative to engine block and chassis; clean/tighten ground points.
- If relay and wiring OK but no starter activation, apply battery voltage directly to starter solenoid (bench or with jumper) to confirm starter/solenoid operation (workshop-safe procedures and precautions required).
- Scan immobiliser/BCM for related codes and verify the immobiliser is allowing starter enable; follow manufacturer immobiliser diagnostics if present.
- If wiring/relay/solenoid OK and immobiliser not at fault, inspect PCM/BCM connectors and test for proper operation or reference manufacturer procedures for module replacement/coding.
- After repair, clear codes and perform multiple start attempts to verify fault does not return; document test results.
Likely causes
- Blown fuse or defective starter relay
- High resistance at connector or ground causing voltage drop
- Open control wire from ignition switch to starter relay/PCM
- Starter solenoid not actuating due to internal failure
- Immobiliser not releasing starter enable signal
Fault status
Status
Ignition start circuit fault detected. Starter control circuit out of expected range or not responding. Check battery, fuses/relays, wiring/connectors, starter/solenoid and immobiliser/BCM signals.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
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89
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