DF1012

Code

RENAULT D

-> P1525 - Coherences information multiplexed for RV / LV

Brand: RENAULT

Type: D

Views: UK: 2 EN: 3 RU: 1

AI status

Completed

ready

Completed 100%

Page language: EN

Warning lamp or message on dash related to vehicle configuration/communication
Loss or improper operation of side-specific functions (mirrors, windows, lights, sensors)
Intermittent operation that may improve after ignition cycles or tap on harness/connectors
Other communication-related DTCs present (U-codes or manufacturer network faults)
Inconsistent live-data values for left vs right-side sensors or status bits

Read all stored and pending DTCs and note freeze-frame/live-data
Check for related U-codes (bus/module communication) and manufacturer codes
Visually inspect wiring harnesses and connectors for the RV/LV modules for corrosion, damage and water ingress
Check fuses and module power/ground pins for proper battery voltage and chassis ground
Measure CAN bus end-to-end resistance (should be ~60 ohm with ignition on) and check for proper termination
Use scanner to view left/right module message fields, counters and CRCs; compare values

Battery supply to modules: ~12 V (measured at module + terminal with ignition ON)
Ground continuity: module ground to chassis < 1 ohm
CAN bus end-to-end resistance: ~60 ohms (two 120 ohm terminators in parallel)
Idle CANH and CANL voltages: ~2.5 V each (differential ~0 V when recessive), dominant differential ~1.5–2.0 V
Expected message frequency: depend on manufacturer — check scanner for RV/LV message IDs, counters and CRC fields
Check message counters/timestamps for gaps or repeated frames indicating missed or corrupted messages

Connect a full-function scan tool and read all DTCs; save freeze-frame and live data for RV and LV related parameters.
Identify related U-codes or P-codes and note which modules report loss or incoherence.
Visually inspect connectors and harnesses for the left & right side modules (look for moisture, corrosion, bent pins, taped repairs).
Verify module power and ground at each module connector with key ON; repair any supply or ground faults.
Measure CAN bus resistance between CAN high and CAN low at appropriate connector — expect ~60 ohms. Repair missing/incorrect termination if present.
Monitor the CAN bus with a scope while operating the affected function or wiggling harness to reproduce fault; look for missing frames, noise or dominant states.
If one module is not transmitting or sends corrupted frames, swap with known-good identical module (if practical) to confirm module fault — only after verifying wiring/power.
If software mismatch is suspected after module replacement, check for required configuration or coding and reprogram/update per manufacturer procedure.
Clear codes and perform road/functional test to confirm fault does not return before declaring repair complete.

⚠️ Status

Multiplex communication incoherence detected between right and left side modules (RV/LV). Data from one side is missing, corrupted or inconsistent.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-4.0 hours

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DF1012 — -> P1525 - Coherences information multiplexed for RV / LV