B1311

Code

LAND ROVER B — Body

Clock Module

Brand: LAND ROVER

Type: B — Body

Views: UK: 17 EN: 32 RU: 16

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Page language: EN

Causes

Blown fuse or missing ignition/backup power supply to the clock module
Poor ground or corroded connector pins
Damaged wiring harness (open/short to battery or ground)
CAN/LIN network communication errors or bus short
Software/firmware corruption or module programming error
Internal hardware failure of the clock module (RTC oscillator, internal electronics)

Symptoms

Clock display incorrect, resets after shutdown, or shows dashes/blank
Date/time settings lost after battery disconnect
Warning messages about clock or related body functions
Dependent features (e.g., vehicle timer, alarm, remote start schedules) not working
Possible related communication warnings in diagnostic scan

What to check

Read and record all stored DTCs and freeze-frame data with a capable scan tool
Visually inspect clock module connector and wiring for corrosion, damage, or water ingress
Check fuses and relays supplying power to the clock module
Verify battery voltage at rest and with ignition on (12.0–14.5 V expected)
Measure module supply and backup voltages at the connector
Check chassis and engine ground points for tightness and low resistance

Signal parameters

Primary supply voltage: ~12 V (ignition ON ~12–14.5 V)
Backup/RTC supply: voltage present when vehicle off (if applicable)
Ground resistance:
CAN bus: CAN_H/CAN_L differential signals present and within expected voltage range (~2.5 V idle)
LIN/K-Line (if used): single-wire communication pulses when commanded
Module responds to OBD/diagnostic tool queries when healthy

Diagnostic algorithm

Connect an OEM-level scan tool, read/record DTCs and module presence. Note any related network U-codes.
Confirm battery voltage and health. Perform a load/charging system check if voltage is low or unstable.
Inspect fuse(s) and relay(s) for the clock/body electronics; replace any open fuses and retest.
Visually inspect connectors and harness for corrosion, bent pins, water damage or rodent chewing. Repair as needed.
Probe the module connector: verify constant and switched power pins, backup power (if applicable), and ground. Repair wiring if values out of range.
Check CAN/LIN continuity and bus integrity. Use an oscilloscope or bus analyzer to confirm valid frames and termination.
If the module is not responding but power/ground and bus are good, attempt a module reset or reprogram/reflash to latest software per OEM procedure.
If reflash fails or module fails to recover, replace the clock module with a dealer-supplied unit and follow required initialization/programming procedures.
Clear DTCs and perform a full system scan; verify clock operation and proper communication during road or functional test.
Re-check for reoccurrence of DTC and document repairs.

Likely causes

Lost or intermittent power (fuse, ignition feed, backup battery for RTC)
Faulty ground connection or high-resistance earth
CAN bus communication fault preventing module reporting
Module internal failure requiring replacement or reflash

Fault status

⚠️ Status

Clock Module fault detected — internal fault or communication/power issue preventing normal operation. Module may be unresponsive, displaying incorrect time, or reporting intermittent errors on the vehicle network.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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B1311 — Clock Module