Power Source Control
- Stop Light Switch1
- Steering Unlock Switch
- Shift P Signal
- Neutral SW/ Clutch SW
- IG Relay Monitor (Inside)
- IG Relay Monitor (Outside)
- Latch Circuit
- Starter Request Signal
- Power Supply Condition
| Last Modified: 11-20-2023 | 6.11:8.1.0 | Doc ID: RM1000000014TP3 |
| Model Year Start: 2018 | Model: Camry | Prod Date Range: [06/2017 - 03/2020] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): Engine does not Start; 2018 - 2020 MY Camry [06/2017 - 03/2020] | ||
|
Engine does not Start |
DESCRIPTION
When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift lever is in P and the brake pedal is depressed, the engine can be started by pressing the engine switch. If the steering is unlocked, the engine can also be started by pressing the engine switch with the shift lever in N and the brake pedal depressed.
Related Data List and Active Test Items
|
Problem Symptom |
Data List and Active Test |
|---|---|
|
Engine does not start |
Smart Key
Starting Control
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
-
The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
Click here
![2018 - 2022 MY Camry [03/2017 - 08/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
-
If the smart key system (for Start Function) has been disabled, enable the system before performing troubleshooting.
Click here
- Inspect the fuses of circuits related to this system before performing the following procedure.
-
Before replacing the certification ECU (smart key ECU assembly) or an electrical key transmitter sub-assembly, refer to smart key system (for Start Function) Precaution.
Click here
- After completing repairs, confirm that the problem does not recur.
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."
HINT:
- If the engine switch is changed from on (IG) to on (ACC) with the shift lever in any position other than P, and then the shift lever is moved to P and the engine switch is pressed with the brake pedal depressed, the engine switch will turn off.
- If the brake pedal is repeatedly depressed while the engine is stopped, the brake booster pressure will be released and the force required to depress the brake pedal to illuminate the stop lights will increase.
PROCEDURE
|
1. |
CHECK ENGINE CRANKING OPERATION |
(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.
(b) Move the shift lever to P.
(c) Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch and check that the engine cranks.
|
Result |
Proceed to |
|---|---|
|
Engine cranks and initial combustion occurs |
A |
|
Engine cranks but initial combustion does not occur |
B |
|
Engine does not crank |
C |
| A |
|
GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly) |
| B |
|
GO TO SFI SYSTEM for A25A-FKS: Click here
for 2GR-FKS: Click here
|
|
|
2. |
CHECK ENGINE SWITCH CONDITION |
(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.
(b) Move the shift lever to P.
(c) With the brake pedal released, check that pressing the engine switch causes the power source mode to change.
|
Result |
Proceed to |
|---|---|
|
Power source mode changes : Off → on (ACC) → on (IG) → off |
A |
|
Power source mode does not change to on (ACC) or on (IG) |
B |
|
Power source mode changes to on (IG) but not to on (ACC) |
C |
|
Power source mode changes to on (ACC) but not to on (IG) |
D |
| B |
|
GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG and ACC)) |
| C |
|
GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (ACC)) |
| D |
|
GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG)) |
|
|
3. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH1) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Power Source Control / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Power Source Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Stop Light Switch1 |
State of brake pedal |
OFF or ON |
OFF: Brake pedal released ON: Brake pedal depressed |
|
Body Electrical > Power Source Control > Data List
|
Tester Display |
|---|
|
Stop Light Switch1 |
OK:
The Techstream display changes correctly in response to the brake pedal operation.
| NG |
|
|
|
4. |
READ VALUE USING TECHSTREAM (NEUTRAL SW/ CLUTCH SW, SHIFT POSITION P OR N) |
(a) Enter the following menus: Body Electrical / Power Source Control or Starting Control / Data List.
(b) Read the Data List according to the display on the Techstream.
Body Electrical > Power Source Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Neutral SW/ Clutch SW |
Shift position (P and N) |
OFF or ON |
OFF: Shift lever in any position other than P or N ON: Shift lever in P or N |
|
Body Electrical > Power Source Control > Data List
|
Tester Display |
|---|
|
Neutral SW/ Clutch SW |
Body Electrical > Starting Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Shift Position P or N |
Park/Neutral position switch status |
OFF or ON |
OFF: Shift lever not in P or N ON: Shift lever in P or N |
When OFF is displayed, the engine will not crank. |
Body Electrical > Starting Control > Data List
|
Tester Display |
|---|
|
Shift Position P or N |
OK:
The Techstream display changes correctly in response to the shift lever operation.
| NG |
|
|
|
5. |
READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL) |
(a) Enter the following menus: Body Electrical / Power Source Control / Data List.
(b) Read the Data List according to the display on the Techstream.
Body Electrical > Power Source Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Starter Request Signal |
Engine start request signal status |
OFF or ON |
OFF: The engine switch is not pressed ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held |
|
Body Electrical > Power Source Control > Data List
|
Tester Display |
|---|
|
Starter Request Signal |
NOTICE:
Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch.
OK:
The Techstream display changes correctly in response to the engine switch operation.
| NG |
|
|
|
6. |
READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL) |
(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.
(b) Move the shift lever to P.
(c) Enter the following menus: Body Electrical / Starting Control / Data List.
(d) According to the display on the Techstream, read the Data List while pressing the engine switch with the brake pedal depressed.
Body Electrical > Starting Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Starter SW |
Starter operation request |
OFF or ON |
OFF: Starter operation not requested ON: Starter operation requested |
When OFF is displayed, the engine will not crank. |
Body Electrical > Starting Control > Data List
|
Tester Display |
|---|
|
Starter SW |
OK:
The Techstream display changes.
| NG |
|
|
|
7. |
INSPECT ST RELAY |
(a) Inspect the ST relay.
for A25A-FKS: Click here
for 2GR-FKS: Click here
| NG |
|
REPLACE ST RELAY |
|
|
8. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY) |
|
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
HINT: *: While the engine is cranking, the battery voltage may drop to approximately 6 V. |
|
| NG |
|
|
|
9. |
CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY AND GROUND) |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Engine room relay block and junction block assembly ST relay terminal 5 - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - ST RELAY) |
(a) Disconnect the C61*1 or C103*2 starter assembly connector.
- *1: for A25A-FKS
- *2: for 2GR-FKS
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for A25A-FKS
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Engine room relay block and junction block assembly ST relay terminal 3 - C61-1 |
Always |
Below 1 Ω |
|
Engine room relay block and junction block assembly ST relay terminal 3 or C61-1 - Other terminals and body ground |
Always |
10 kΩ or higher |
for 2GR-FKS
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Engine room relay block and junction block assembly ST relay terminal 3 - C103-1 |
Always |
Below 1 Ω |
|
Engine room relay block and junction block assembly ST relay terminal 3 or C103-1 - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - BATTERY) |
(a) Disconnect the D1*1 or C74*2 starter assembly connector.
- *1: for A25A-FKS
- *2: for 2GR-FKS
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for A25A-FKS
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D1-1 - Body ground |
Always |
11 to 14 V |
for 2GR-FKS
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C74-1 - Body ground |
Always |
11 to 14 V |
| OK |
|
REPLACE STARTER ASSEMBLY for A25A-FKS: Click here
for 2GR-FKS: Click here
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
12. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SOURCE AND BODY GROUND) |
(a) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
w/ Dynamic Radar Cruise Control System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A37-7 (B) - Body ground |
Always |
11 to 14 V |
w/o Dynamic Radar Cruise Control System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A38-1 (B) - Body ground |
Always |
11 to 14 V |
Standard Resistance:
w/ Dynamic Radar Cruise Control System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A37-2 (GND) - Body ground |
Always |
Below 1 Ω |
w/o Dynamic Radar Cruise Control System:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A38-3 (GND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
13. |
INSPECT STOP LIGHT SWITCH ASSEMBLY |
(a) Inspect the stop light switch assembly.
Click here
| NG |
|
|
|
14. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY) |
(a) Disconnect the A37*1 or A38*2 stop light switch assembly connector.
(b) Disconnect the R8 certification ECU (smart key ECU assembly) connector.
(c) Disconnect the A24*3 or A21*4 ECM connector.
(d) Disconnect the A33 skid control ECU (brake actuator assembly) connector.
(e) Disconnect the K27 shift lock control unit assembly connector.
(f) Disconnect the R47 center stop light set connector.
(g) Disconnect the W13 rear light assembly LH connector.
(h) Disconnect the W12 rear light assembly RH connector.
- *1: w/ Dynamic Radar Cruise Control System
- *2: w/o Dynamic Radar Cruise Control System
- *3: for A25A-FKS
- *4: for 2GR-FKS
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/ Dynamic Radar Cruise Control System
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R8-25 (STP1) - A37-3 (L) |
Always |
Below 1 Ω |
|
R8-25 (STP1) or A37-3 (L) - Other terminals and body ground |
Always |
10 kΩ or higher |
w/o Dynamic Radar Cruise Control System
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R8-25 (STP1) - A38-2 (L) |
Always |
Below 1 Ω |
|
R8-25 (STP1) or A38-2 (L) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
15. |
INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
(a) Remove the park/neutral position switch assembly.
for UB80E: Click here
for UA80E: Click here
(b) Inspect the park/neutral position switch assembly.
for UB80E: Click here
for UA80E: Click here
| NG |
|
REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for UB80E: Click here
for UA80E: Click here
|
|
|
16. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the A13 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A13-9 (STAR) - C55-4 (B) |
Always |
Below 1 Ω |
|
A13-9 (STAR) or C55-4 (B) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
17. |
CHECK STEERING LOCK FUNCTION |
(a) Check that the steering unlocks when the engine switch is turned on (ACC).
OK:
The steering unlocks.
| OK |
|
| NG |
|
GO TO OTHER PROBLEM (Unable to Unlock Steering Wheel (Engine cannot Start)) |
|
18. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
HINT: *: While the engine is cranking, the battery voltage may drop to approximately 6 V. |
|
| NG |
|
|
|
19. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the A13 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the C55 park/neutral position switch assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A13-9 (STAR) - C55-4 (B) |
Always |
Below 1 Ω |
|
A13-9 (STAR) or C55-4 (B) - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
20. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Install the ST relay to the engine room relay block and junction block assembly.
|
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
HINT: *: While the engine is cranking, the battery voltage may drop to approximately 6 V. |
|
| NG |
|
|
|
21. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY) |
(a) Disconnect the A13 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A13-20 (STA) - 2 (ST relay) |
Always |
Below 1 Ω |
|
A13-20 (STA) or 2 (ST relay) - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
22. |
CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C55-9 (L) - 2 (ST relay) |
Always |
Below 1 Ω |
|
C55-9 (L) or 2 (ST relay) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
GO TO SFI SYSTEM for A25A-FKS: Click here
for 2GR-FKS: Click here
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|