DTC B1007:12 [BCM]

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Malfunction Location

• Headlight high beam circuit malfunction

Detection Condition

• Short to power supply detected in headlight high beam circuit with the light switch off

Possible Causes

• Short circuit to power supply in wiring harness between headlight high relay terminal D and BCM connector terminal 1I

• Short circuit to power supply in wiring harness between headlight high LH connector terminal 2C and BCM connector terminal 1I

• Short circuit to power supply in wiring harness between headlight high RH connector terminal 2C and BCM connector terminal 1I

• Short circuit to ground in wiring harness between headlight high relay terminal E and light switch connector terminal H

• Headlight high relay malfunction

• Headlight high RH malfunction

• Headlight high LH malfunction

• Light switch malfunction

• BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

PERFORM DTC INSPECTION

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Perform the BCM DTC inspection using the M-MDS with the light switch off.
(See DTC INSPECTION [BCM].)

•  Is DTC B1007:12 displayed?

Yes

Go to the next step.

No

DTC troubleshooting completed.

2

INSPECT HEADLIGHT HIGH RELAY

•  Switch the ignition to off.

•  Disconnect the negative battery cable.

•  Disconnect the headlight high relay.

•  Inspect the headlight high relay.
(See RELAY INSPECTION.)

•  Is the headlight high relay normal?

Yes

Go to the next step.

No

Replace the headlight high relay.

After replacement, go to Step 10.

3

INSPECT LIGHT SWITCH CONNECTOR CONDITION

•  Disconnect the light switch connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is the connector normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to Step 10.

4

INSPECT LIGHT SWITCH

•  Inspect the light switch.
(See LIGHT SWITCH INSPECTION.)

•  Is the light switch normal?

Yes

Go to the next step.

No

Replace the light switch.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

After replacement, go to Step 10.

5

INSPECT HEADLIGHT HIGH BEAM SWITCH CIRCUIT FOR SHORT CIRCUIT TO GROUND

•  Inspect for continuity between light switch connector terminal H and body ground.

•  Is there continuity?

Yes

Repair/replace the wiring harness.

After repair procedure, go to Step 10.

No

Go to the next step.

6

INSPECT BCM CONNECTOR CONDITION

•  Disconnect the BCM connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is the connector normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to Step 10.

7

INSPECT HEADLIGHT HIGH BEAM CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY

•  Reconnect the negative battery cable.

•  Measure the voltage at BCM connector terminal 1I.

•  Can the voltage be measured?

Yes

Go to the next step.

No

Go to Step 10.

8

INSPECT HEADLIGHT HIGH CONNECTOR CONDITION

•  Disconnect the negative battery cable.

•  Disconnect the headlight high RH connector.

•  Disconnect the headlight high LH connector.

•  Inspect the connectors and terminals (corrosion, damage, pin disconnection).

•  Are the connectors normal?

Yes

Go to the next step.

No

Repair/replace the malfunctioning vehicle connectors or terminal.

After repair procedure, go to Step 10.

9

INSPECT HEADLIGHT HIGH BEAM CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY

•  Reconnect the negative battery cable.

•  Inspect the wiring harness between the following connector terminals.

―  Headlight high LH connector terminal 2C—BCM connector terminal 1I

―  Headlight high RH connector terminal 2C—BCM connector terminal 1I

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the malfunctioning vehicle wiring harness.

After replacement, go to the next step.

10

VERIFY DTC

•  Reconnect the disconnected connectors and the negative battery cable.

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Perform the BCM DTC inspection using the M-MDS with the light switch off.
(See DTC INSPECTION [BCM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

11

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Are there other DTCs output?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

Step	Inspection		Action
1	PERFORM DTC INSPECTION • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS with the light switch off. (See DTC INSPECTION [BCM].) • Is DTC B1007:12 displayed?	Yes	Go to the next step.
1		No	DTC troubleshooting completed.
2	INSPECT HEADLIGHT HIGH RELAY • Switch the ignition to off. • Disconnect the negative battery cable. • Disconnect the headlight high relay. • Inspect the headlight high relay. (See RELAY INSPECTION.) • Is the headlight high relay normal?	Yes	Go to the next step.
2		No	Replace the headlight high relay. After replacement, go to Step 10.
3	INSPECT LIGHT SWITCH CONNECTOR CONDITION • Disconnect the light switch connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is the connector normal?	Yes	Go to the next step.
3		No	Repair/replace the connector or terminal. After repair procedure, go to Step 10.
4	INSPECT LIGHT SWITCH • Inspect the light switch. (See LIGHT SWITCH INSPECTION.) • Is the light switch normal?	Yes	Go to the next step.
4		No	Replace the light switch. (See LIGHT SWITCH REMOVAL/INSTALLATION.) After replacement, go to Step 10.
5	INSPECT HEADLIGHT HIGH BEAM SWITCH CIRCUIT FOR SHORT CIRCUIT TO GROUND • Inspect for continuity between light switch connector terminal H and body ground. • Is there continuity?	Yes	Repair/replace the wiring harness. After repair procedure, go to Step 10.
5		No	Go to the next step.
6	INSPECT BCM CONNECTOR CONDITION • Disconnect the BCM connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is the connector normal?	Yes	Go to the next step.
6		No	Repair/replace the connector or terminal. After repair procedure, go to Step 10.
7	INSPECT HEADLIGHT HIGH BEAM CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY • Reconnect the negative battery cable. • Measure the voltage at BCM connector terminal 1I. • Can the voltage be measured?	Yes	Go to the next step.
7		No	Go to Step 10.
8	INSPECT HEADLIGHT HIGH CONNECTOR CONDITION • Disconnect the negative battery cable. • Disconnect the headlight high RH connector. • Disconnect the headlight high LH connector. • Inspect the connectors and terminals (corrosion, damage, pin disconnection). • Are the connectors normal?	Yes	Go to the next step.
8		No	Repair/replace the malfunctioning vehicle connectors or terminal. After repair procedure, go to Step 10.
9	INSPECT HEADLIGHT HIGH BEAM CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY • Reconnect the negative battery cable. • Inspect the wiring harness between the following connector terminals. ― Headlight high LH connector terminal 2C—BCM connector terminal 1I ― Headlight high RH connector terminal 2C—BCM connector terminal 1I • Is the wiring harness normal?	Yes	Go to the next step.
9		No	Replace the malfunctioning vehicle wiring harness. After replacement, go to the next step.
10	VERIFY DTC • Reconnect the disconnected connectors and the negative battery cable. • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS with the light switch off. (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
10		No	Go to the next step.
11	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are there other DTCs output?	Yes	Perform the corresponding DTC inspection.
11		No	DTC troubleshooting completed.