Lighting System (For Sedan) Drl Relay Circuit

Vehicle Exterior. Yaris. Ncp93, 131

Lighting (Ext). Yaris. Ncp93, 131

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY ASSEMBLY - BATTERY, IG1 RELAY AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (HEADLIGHT - RUNNING LIGHT RELAY ASSEMBLY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - RUNNING LIGHT RELAY ASSEMBLY)

CHECK HARNESS AND CONNECTOR (GENERATOR - RUNNING LIGHT RELAY ASSEMBLY)

CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH ASSEMBLY - RUNNING LIGHT RELAY ASSEMBLY)

LIGHTING SYSTEM (for Sedan) - DRL Relay Circuit

DESCRIPTION

When the engine is started, signals are transmitted from the generator to the running light relay assembly, causing the headlights to illuminate.

WIRING DIAGRAM

Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Sedan) Drl Relay Circuit

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY ASSEMBLY - BATTERY, IG1 RELAY AND BODY GROUND)

Disconnect the D9 running light relay assembly connector.

Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Sedan) Drl Relay Circuit

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
D9-3 (+B) - Body ground
Always
11 to 14 V
D9-12 (IG) - Body ground
Ignition switch ON
11 to 14 V

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
D9-2 (E) - Body ground
Always
Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Running Light Relay Assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.CHECK HARNESS AND CONNECTOR (HEADLIGHT - RUNNING LIGHT RELAY ASSEMBLY)

Disconnect the B6 or B4 headlight connector.

Disconnect the D9 running light relay assembly connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
B6-1 or B4-1 - D9-1
Always
Below 1 Ω
B6-1 or B4-1 - Body ground
Always
10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - RUNNING LIGHT RELAY ASSEMBLY)

Disconnect the D4 headlight dimmer switch assembly connector.

Disconnect the D9 running light relay assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D4-12 (RF) - D9-7 (H)	Always	Below 1 Ω
D4-9 (HU) - D9-8 (HI)	Always	Below 1 Ω
D4-4 (LFG) - D9-16 (FOG)*1	Always	Below 1 Ω
D4-12 (RF) - Body ground	Always	10 kΩ or higher
D4-9 (HU) - Body ground	Always	10 kΩ or higher
D4-4 (LFG) - Body ground*1	Always	10 kΩ or higher

*1: w/ Fog Light

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK HARNESS AND CONNECTOR (GENERATOR - RUNNING LIGHT RELAY ASSEMBLY)

Disconnect the C9 generator connector.

Disconnect the D9 running light relay assembly connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
C9-4 (L) - D9-9 (CHG-)
Always
Below 1 Ω
C9-4 (L) - Body ground
Always
10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH ASSEMBLY - RUNNING LIGHT RELAY ASSEMBLY)

Disconnect the D21 parking brake switch assembly connector.

Disconnect the D9 running light relay assembly connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
D21-1 - D9-11 (PKB)
Always
Below 1 Ω
D21-1 - Body ground
Always
10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE RUNNING LIGHT RELAY ASSEMBLY