Diagnostics and testing of direction indicators (Discovery 3)

Direction indicators and hazard warning lights

For a detailed description of the system design and operation, refer to Section 417-01 "Exterior Lighting" in the Service Station Manual.

When diagnosing faults with a cornering light/fixed-angle cornering light, please note the slight difference in operation when equipped with an Adaptive Front-lighting System (AFS).

Inspection and verification

1. Ensure that the customer's complaint is justified.

Please note that intermittent fault messages may be caused by the cycling nature of the field effect transistors (FETs).

2. Visually inspect for obvious electrical problems.

Mechanical factors

Electrical factors

Status and installation of the pointer (pointers) turn Condition and installation of the cornering light(s) Lamps and installation Lamp holders and installation Light switch and its installation Condition and installation of the left multifunction switch on the steering column Status and installation of the hazard warning light button

Fuses Battery Junction Box (BJB) - Fuse Link 16E BJB - Fuse Link 11E Central Junction Box (CJB) - Fuse Link 61P Wiring harness Loosening or corrosion of connector(s) Battery Junction Box (BJB) Central Junction Box (CJB) Steering wheel angle sensor ABS control module Instrument cluster (IPC) Adaptive Front-lighting System (AFS) module Auxiliary Restraint System Control Module CAN electrical circuits (Control Area Network)

(The article is based on information from the website: lrman.ru)



3. If an obvious cause for the problem you identified or the customer described is found, correct it before moving on to further actions. (if possible).

4. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before referring to the symptom chart or DTC index.

Since DTCs are stored in more than one module, a full vehicle data read is recommended.

Clear all DTCs after troubleshooting.

Table of signs of malfunction

Sign of malfunction	Possible reasons	Actions
Direction indicator(s)/hazard warning light(s) not working	Lamp failure The fuse(s) has blown Electrical circuit failure Left multifunction switch on steering column faulty Hazard warning light button malfunction	Check the condition of the lamp and fuse (see visual inspection table). Check the turn signal/hazard warning lamp circuits. Check the operation of the left multifunction switch on the steering column. Check the operation of the hazard warning lamp switch. Refer to the electrical manual. Check for DTCs indicating a malfunction in the turn signal/hazard warning lamp circuit.
Dim turn signal/hazard warning light(s)	Incorrect lamp power Electrical circuit failure Left multifunction switch on steering column faulty Hazard warning light button malfunction	Check the condition and power of the lamp. Check the electrical circuits of the direction indicators/hazard warning lights. Check the operation of the left multifunction switch on the steering column. Check the operation of the hazard warning light button. Refer to the electrical equipment manual.
Direction indicator(s)/hazard warning light(s) are constantly on	Left multifunction switch on steering column faulty Hazard warning light button malfunction Electrical circuit failure	Check the turn signal/hazard warning lamp circuits. Check the operation of the left multifunction switch on the steering column. Check the operation of the hazard warning lamp switch. Refer to the electrical manual. Check for DTCs indicating a malfunction in the turn signal/hazard warning lamp circuit.
The indicator lamp(s) does not work	The fuse(s) has blown Left multifunction switch on steering column faulty The hazard warning light button does not work Electrical circuit failure Instrument cluster malfunction	Check the fuse(s) (see visual inspection). Check the operation of the left multifunction switch on the steering column. Check the operation of the hazard warning light switch. Check the electrical circuits of the indicator lamp. Refer to the electrical equipment manual. Check for DTCs indicating a malfunction of the instrument cluster or CAN system.
The cornering light(s) does not work	Lamp failure The fuse(s) has blown Electrical circuit failure Left multifunction switch on steering column faulty The light switch is faulty	Check the condition of the lamp and fuse. (see visual inspection table). Check the cornering light circuits Check the operation of the light switch Check the operation of the left multifunction switch on the steering column Refer to the electrical manual Check for DTCs indicating a malfunction in the cornering light circuits
Dim light of cornering headlight(s)	Incorrect lamp power Electrical circuit failure Left multifunction switch on steering column faulty The light switch is faulty	Check the condition and power of the lamp. Check the electrical circuits of the cornering lights. Check the operation of the left multifunction switch on the steering column. Check the operation of the light switch. Refer to the electrical equipment manual.
The cornering light(s) is constantly on	Left multifunction switch on steering column faulty The light switch is faulty Electrical circuit failure	Check the cornering lamp circuits. Check the operation of the left multifunction switch on the steering column. Check the operation of the light switch. Refer to the electrical manual. Check for DTCs indicating a malfunction in the cornering lamp circuits.

DTC Index

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

DTC codes	Description	Possible reasons	Actions
B1C9811	Left cornering light electrical circuit	Left cornering light: short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1C9815	Left cornering light electrical circuit	Left cornering light: short circuit to battery + Left cornering light: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1C9911	Right cornering light electrical circuit	Right cornering light: short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1C9915	Right cornering light electrical circuit	Right cornering light: short circuit to battery + Right cornering light: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0611	Left turn signal	Left turn signal: short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0615	Left turn signal	Left turn signal: short circuit to battery + Left turn signal: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0711	Right turn signal	Right turn signal: short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0715	Right turn signal	Right turn signal: short circuit to battery + Right turn signal: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D3523	Hazard warning light switch.	Hazard Warning Light Switch Circuit: Signal Stuck at Low Voltage	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D3613	Turn signal switch	Left multifunction switch on steering column: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D4013	Electrical circuit for connecting the light switch	Electrical connection of the light switch circuit: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
U1A1449	CAN initialization failure	Internal electronic malfunction	Check the electrical power and ground circuits of the unit. Refer to the electrical manual. Configure the module(s) using the approved diagnostic system. If a module is suspect, refer to the warranty policy and procedures manual.