[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > ETACS > INPUT SIGNAL PROCEDURES > THE STOP LAMP SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU.
Inspection Procedure 12: The stop lamp switch signal is not received.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
The stop lamp switch input signal is used for the operation judgement of the functions below. If the signal is abnormal, these functions will not work.
  • ASC
  • Shift lock mechanism
  • OSS
  • Cruise control system
 
 
PROBABLE CAUSES
  • Malfunction of stop lamp switch
  • Malfunction of stop lamp relay*
  • Malfunction of ETACS-ECU
  • Damaged harness wires and connectors
note*: The stop lamp relay cannot be inspected because it is a semiconductor relay.
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check the stop lamp switch.
Check the stop lamp switch. Refer to GROUP 35A - Brake Pedal .
Is the check result normal?
Go to Step 2.
Replace the stop lamp switch.
 
STEP 2. Voltage measurement at ETACS-ECU connector (BKLP terminal).
(1) Measure by backprobing without disconnecting the ETACS-ECU connector and stop lamp switch connector.
(2) Check the voltage between the ETACS-ECU connector (BKLP terminal) and body earth.
OK:
  • When the brake pedal is released: Approximately 0 V - 5 V (pulse)
  • When the brake pedal is depressed: Approximately system voltage
Is the check result normal?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of short to power supply, short to earth, and open circuit in BKLP line between ETACS-ECU connector and stop lamp switch connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness
 
STEP 4. Check of short to power supply, short to earth, and open circuit in STP line between ETACS-ECU connector and stop lamp switch connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness
 
STEP 5. M.U.T.-IIISE data list
Temporarily replace the stop lamp relay, and then depress the brake pedal.
 
Item No.Item nameNormal condition
113Stop lamp switchON
OK: Normal condition is displayed.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.