Nissan Altima HL32 Hybrid. Manual - part 685

P1805-902

HBC-489

< COMPONENT DIAGNOSIS >

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2.

CHECK STOP LAMP SWITCH CIRCUIT

1. Turn ignition switch OFF.

2. Check the stop lamp when depressing and releasing the brake pedal.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 3.

3.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Check the voltage between stop lamp switch harness connector

and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Junction block connector E6

• 10A fuse (No. 7)

• Harness for open or short between stop lamp switch and battery

>> Repair open circuit or short to ground in harness or connectors.

5.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect hybrid vehicle control ECU harness connector.

2. Check the continuity between hybrid vehicle control ECU harness connector and stop lamp switch har-

ness connector.

3. Also check harness for short to ground.
Is the inspection result normal?

YES

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Joint connector E-4

• Harness for open or short between hybrid vehicle control ECU and stop lamp switch

>> Repair open circuit or short to ground in harness or connectors.

Brake pedal

Stop lamp

Fully released

Not illuminated

Slightly depressed

Illuminated

Stop lamp switch (A)

Ground

Voltage

Harness

connector

Terminal

E38

1

Ground

Battery voltage

JMCIA0234ZZ

Hybrid vehicle control ECU

Stop lamp switch

Continuity

Harness

connector

Terminal

Harness

connector

Terminal

E66

148 (STP)

E38

2

Existed

HBC-490

< COMPONENT DIAGNOSIS >

P1805-902

7.

CHECK STOP LAMP SWITCH

Refer to 

HBC-490, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace stop lamp switch.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Stop Lamp Switch)

INFOID:0000000004212095

1.

CHECK STOP LAMP SWITCH-I

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Check the continuity between stop lamp switch terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH-II

1. Adjust stop lamp switch installation. Refer to 

BR-12, "Inspection and Adjustment"

.

2. Check the continuity between stop lamp switch terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch.

Stop lamp switch 

(A)

Condition

Continuity

Terminals

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

JMCIA0235ZZ

Stop lamp switch 

(A)

Condition

Continuity

Terminals

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

JMCIA0235ZZ

P1805-903, P1805-923

HBC-491

< COMPONENT DIAGNOSIS >

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P1805-903, P1805-923

Description

INFOID:0000000004212096

The brake switch signal is applied to the hybrid vehicle control ECU through the stop lamp switch when the

brake pedal is depressed. The brake ECU also receives the stop lamp signal and sends this signal as a brake

switch signal to the hybrid vehicle control ECU through CAN communication line.

The hybrid vehicle control ECU performs the rationality check for these two input signals.

DTC Logic

INFOID:0000000004212097

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Fully depress the brake pedal for at least 5 seconds.

3. Fully release the brake pedal for at least 5 seconds.

4. Check DTC.
Is DTC detected?

YES

>> Go to 

HBC-491, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004212098

1.

PRECONDITIONING

• Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with

converter assembly, take safety precautions such as wearing insulated gloves and removing the service

plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent

other technicians from accidentally reconnecting it while you are working on the high-voltage system.

• After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage

connectors or terminals.

• Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with

converter assembly.

>> GO TO 2.

2.

CHECK DTC FOR BRAKE ECU

Check DTC for the brake ECU. Refer to 

BRC-45, "CONSULT-III Function"

.

Is DTC detected?

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 3.

3.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT TO HYBRID VEHICLE CONTROL ECU FOR

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P1805

903

Brake switch

Rationally incorrect voltage signal from the stop 
lamp switch (ON signal) is sent to hybrid vehicle 
control ECU, compared with the brake switch 
signal (OFF signal) sent from the brake ECU.

• Harness or connectors

(Stop lamp switch circuit is 
open or shorted.)

• Stop lamp switch
• Brake  ECU
• Hybrid vehicle control ECU

P1805

923

Brake switch

Rationally incorrect voltage signal from the stop 
lamp switch (OFF signal) is sent to hybrid vehicle 
control ECU, compared with the brake switch 
signal (ON signal) sent from the brake ECU.

• Harness or connectors

(Stop lamp switch circuit is 
open or shorted.)

• Stop lamp switch
• Brake  ECU
• Hybrid vehicle control ECU

HBC-492

< COMPONENT DIAGNOSIS >

P1805-903, P1805-923

OPEN AND SHORT

 With CONSULT-III

1. Turn ignition switch ON.

2. Select “BRAKE SWITCH” in “” mode with CONSULT-III.

3. Check “BRAKE SWITCH” indication under the following conditions.

 With GST

1. Turn ignition switch ON.

2. Check the voltage between hybrid vehicle control ECU harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 4.

4.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT TO HYBRID VEHICLE CONTROL ECU FOR

OPEN AND SHORT-II
1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Disconnect hybrid vehicle control ECU harness connector.

4. Check the continuity between hybrid vehicle control ECU harness connector and stop lamp switch har-

ness connector.

5. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> Replace hybrid vehicle control ECU.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.

• Joint connector E-4

• Harness for open or short between hybrid vehicle control ECU and stop lamp switch

>> Repair open circuit or short to ground or short to power in harness or connectors.

6.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT TO BRAKE ECU FOR OPEN AND SHORT-II

1. Turn ignition switch OFF.

2. Check the continuity between brake ECU harness connector and stop lamp switch harness connector for

open and short.

Refer to 

BRC-148, "Wiring Diagram - BRAKE CONTROL SYSTEM -"

.

Is the inspection result normal?

YES

>> Replace brake ECU.

NG

>> Repair or replace harness or connectors.

Monitor item

Condition

Indication

BRAKE SWITCH

Brake pedal

Slightly depressed

ON

Fully released

OFF

Hybrid vehicle control ECU

Ground

Condition

Voltage

Harness 

connector

Terminal

E66

148 (Stop lamp switch signal)

Ground

Brake pedal

Slightly depressed

Battery voltage

Fully released

Approx. 0V

hybrid vehicle control ECU

Stop lamp switch

Continuity

Harness

connector

Terminal

Harness

connector

Terminal

E66

148 (STP)

E38

2

Existed