Supplier Annual conference 2022

1. Supplier quality evaluation manual Y2022 1.1 Target Y2022 *** A level = Supplier evaluation score 99 points up 99

1. Supplier quality evaluation manual Y2022 1.2 Quality evaluation score manual Y2022 *** The period from the 26th day of the immediately preceding period through the 25th day of the current period. 100

1. Supplier quality evaluation manual Y2022 1.2 Quality evaluation score manual Y2022 40 S1 : Claim (PPM) < 10 PPM 20 S2 : PDR & 8D reply 1 PDR + Reply 8D within due date No repeat issue + No disruption TSPK 20 S3 : Problem Support activity frequency 20 S4 : Co-operation 100 S5 : Field claim Without field claim 101

1. Supplier Quality Evaluation Manual S1 : Claim ( PPM ) - 40 Points Claim ( PPM ) = Defect Q′ty x 106 Delivery Q′ty FY2021 Target ≤ 20 PPM Start : April 2022 FY2022 Target ≤ 10 PPM Claim PPM Score Reduce PPM Target from Claim PPM Deducts Score < 20 30 20 PPM to 10 PPM < 10 0 21 - 120 29 - 20 and change PPM Range >10 - 60 - 10 121 - 220 19 - 10 >60 - 110 - 20 221 - 320 >110 - 160 - 30 9-0 - 40 > 320 0 > 160 102

1. Supplier Quality Evaluation Manual S2 : Number of PDR Issue and 8D Report reply - 20 Points S2 = S2.1 + S2.2 = -20 Point S2.1 : Number of PDR Issue -10 Points PDR issue Score Start : April 2022 PDR issue Deduct Score 19 1 0 2 -2 28 3 -4 4 -6 37 5 -8 ≥6 -10 46 55 64 73 82 No deduct score 1st Issue If over deduct score 2 points / PDR 91 Minor case within 7 Days ≥10 0 *** Major case within 3 Days / S2.2 : 8D Report reply -10 Points *** 8D Report Reply Within Due date Over 1 Week Over 2 Weeks Over 3 Weeks Deduct Score 0 -2 -4 -10 103

1. Supplier Quality Evaluation Manual S3 : Problem Frequency - 20 Point S3 = S3.1 + S3.2 + S3.3 = -20 Point S3.1 : Q’ty of Problem Type ≤ 1Type / Month Q’ty Problem 1 2 3 4 Deduct Score 0 -2 -4 -6 S3.2 : Q’ty of Repeat problem time “No repeat problem” 23 4 -4 -6 -8 Repeated Time 0 1 Deduct Score 0 -2 S3.3 : Q’ty of disruption TSPK line “No disruption” Disruption 0 1 Deduct Score 0 -6 New addition Evaluation Criterial *** Supplier must be accept claim only *** 104

1. Supplier Quality Evaluation Manual S4 : Co-Operation & Counter Measurement - 20 Points 4.1 Inspection data - Supplier need to submit monthly inspection data within 25th day. And in February for yearly inspection / annual test. Item Frequency Due date Data Type Monthly inspection data 1 / Month Before 25th Electronic file Full Layout 100% on Dwg. 1 / Year February Electronic file ELV. Regulation (SoC) 1 / Year February Electronic file - Sending data support Over target or Not send Over due date 1 Month 2 Months continue 3 Months continue Over 3 Months -15 Points continue Deduct Score -5 Points -10 Points - 20 points 4.2 Support in TSPK activity - Co-operation in countermeasure problem and support sorting & Repair - Process and product audit : preparation of document and process , including concern person support - Co-operation for new model / ECN : PPAP submission - Process change information : If RPCA. Submit to TSPK less than 4 weeks before SOP. 4.3 Containment action - Quality alert reply within 24 hours and 1st lot information *** If Supplier any feed back over due date deduct score 5 points / Case*** 105

1. Supplier Quality Evaluation Manual S5 : Field Claim *** Supplier must be accept claim only *** S5 Case of field claim at our customer - Customer Disruption - Customer Field return - Customer Notification Case of field claim Domestic parts CKD Parts Deduct Score -5 Point -35 Point 106

2. Quality performance Y2021

2. Quality performance Y2021 2.1 Supplier quality score evaluation result Y2021 Overview of TSPK-G Target > 99 points 100 99.62 99.64 99.91 99.93 120 99.31 100 99.02 99.16 99.46 99.26 98.74 98.93 98.73 98.73 80 95 60 40 20 90 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC AVG. 108

2. Quality performance Y2021 2.2 Top 10 worst supplier P1 P4 109

2. Quality performance Y2021 2.3 Supplier quality trend BMW PTA SPA KLK 98.7 99.0 99.2 98.8 99.2 99.7 98.5 98.5 99.3 97.2 96.5 97.6 2019 2020 2021 2019 2020 2021 2019 2020 2021 2019 2020 2021 Up trend : Suppliers which have a better trend Down trend : Suppliers which downward trend and success to reach the target. “Keep going” over the past year. “Mind your trend” HUAMEI TYL UHM TSAT4 98.8 97.9 98.6 96.55 95.4 96.0 96.7 96.4 96.2 2021 93.4 94.2 93.3 2019 2020 2021 2019 2020 2021 2019 2020 2021 2019 2020 Side way : Suppliers which inadequate improvement continue 3 past year. “Let’s start now” 110

2. Quality performance Y2021 2.4 Lessons learned quality issue (Dimension) Detail Problem Details : BRKT ASS’Y ENGINE LH 1) Engine LH trim line out off spec. 2) Engine LH dimension out off spec. Effect for This Problems 1. Deduct Score 35 points & Problem recurrent 5 points 2. Lost cost for sorting and reworked 1,936,110 Baht (Still Sorting & Rework) No. Process Problem Root cause Improvement In-Charge Mission Description Jan’22 Feb’22 Mar’22 Apr’22 Status QC D Merit / Advantage 111 1. Press 1.On July 02nd'2019, K. Fernandez 1.At the Stamping process 1. Die F1+Pi UHM adjusted Mr. Pongphon  - No complain by customer Pablo notified Engine LH trim line F1+ Pi stopper die damage distance the stopper & die F2 31/07/19 out off spec. was 14.00 mm, which &F2 pad cushion was loose process UHM developed insert it does not meet the specified. due to haven’t PM check die by welding and grinding 2.On November 19'2020 K. Pablo sheet. refer to CAD to solve the die Marafuschi notified Engine LH 2. Insert die upper/Lower 3/5 was loose. 31/07/19 dimension out off spec. & 4/5 damage due to haven’t 2. Make PM check sheet and Mr. Pongphon  PM on plan. traing. 3. New insert die upper/Lower Mr. Sarawut 30/03/22 3/5 & 4/5

2. Quality performance Y2021 2.4 Lessons learned quality issue (Appearance) Detail Detail / Problem : BRKT LOWER ARM is crack. Effect for this problems 1. Deduct score 1 point. 2. Lost cost for sorting 12,696.91 Baht No. Process Problem Root cause Improvement In-Charge Mission Description July 21 Aug Sep 21 Oct 21 Status QC D Merit / Advantage 21 1. ASSY Full BRKT LOWER ARM is Component part thickness reduce - Adjust position die and lock Mr. Tanigpong  No complain by 15/10/21 customer 15/10/21 weld. crack on 12/01/2021 Q'ty lower spec due to die insert die can pin to insert die. 15/10/21 1 U' shifting and daily check die not have - Revise daily check die add point check. point check. - Addition point check thickness reduce on check sheet. 112

2. Quality performance Y2021 2.4 Lessons learned quality issue (Dislocation weld) Detail Detail / Problem : Saddle Spring 4x2 Weld dislocation of bead. Improve clamp for lock parts Effect for this problems 1. Deduct score 5 points. Problem Repeated 2 times 2. Lost cost for sorting 18,384.10 Baht No. Process Problem Root cause Improvement In-Charge Mission Description Jan 21 Feb 21 Mar 21 Apr 21 Status QC D Merit / Advantage 7/01/21 113 1. Welding Q-Gate Axle TSPK-L - Clamp lock Jig assembly loose due - Improvement clamp lock jig Mr. Tanigpong  - No complain by 7/01/21 customer 7/01/21 Assembly. Found Problem Saddle to not have daily check jig and PM assembly. 7/01/21 spring 4x2 weld Plan. - Make daily check jig add point dislocation of bead date check clamp before production. 12/11/20 Q’ty 10 U' - Make PM Plan - Add process 100% check appearance weld.

2. Quality performance Y2021 2.4 Lessons learned quality issue (Wrong assembly) Detail Detail / Problem : MEMBER ASSY-CROSS,FR Position nut NG. Effect for this problems Deduct score customer claim 5 Point No. Process Problem Root cause Improvement In-Charge Mission Description Mar21 Apr21 May21 Jun21 Status Mr. Wannipa QC D Merit / Advantage 1. Welding Customer Information -Locator pin control of assembly jig is - Change Locator pin control of  -No complain by Assembly. MEMBER ASSY- wear due to PM check sheet not assembly jig customer 29/03/21 CROSS,FR Position nut have point check. - Revise PM check sheet add NG effect to process point check diameter pin 29/03/21 assembly at customer on control. 27/03/2021 114

3. Quality activity Y2022

3. Quality activity Y2022 Top 5 suppliers ▪ Countermeasure present 1st month : MGR 2 month cont. : GM 3 month cont. : MD / President “Q” up ▪ Weekly follow up ▪ Measuring system development ▪ Process audit ▪ Customer requirement : CQI, Safety part audit Critical part audit ▪ Product audit Dimension Weld performance Appearance 116

4. Contact person

4. Contact person 4.1 TSPK-G Contact Plant Product group No. Name Position E-mail Axle group 1 Mr. Jaturaporn Pumsakuln MGR QC [email protected] 2 Mr. Nattaporn Pomdee STAFF QC [email protected] TSPK FORD Frame group 3 Mr. Rangsan Chanya SUB FOREMAN QC [email protected] 4 Mr. Prachuab Rodyim FOREMAN QC [email protected] ISUZU Frame group 5 Ms. Paradee Somsuk AMGR QC [email protected] 6 Mr. Sarawut Suya STAFF QC [email protected] TSPK-BP All parts model 7 Mr. Warit Phudtho LEADER PQC [email protected] TSPK-L All parts model 8 Mr. Banluesak Somton LEADER PQC [email protected] 9 Mr. Natthaphon Prathumthong AMGR QC [email protected] 10 Mr. Nanthapong Changhin STAFF QC [email protected] 11 Mr. Manit Khamkula FOREMAN QC [email protected] 12 Mr. Pratuan Khumnenr FOREMAN QC [email protected] 1 Mr. Akekachai Inthajak MGR QC [email protected] 2 Mrs. Wannipa Dachmala STAFF QC [email protected] 3 Mr. Jakkaphol Lakchai SUB LEADER PQC [email protected] 1 Mr. Narathip Pakkunnan MGR QC [email protected] 2 Mr. Tanigpong Mayom STAFF QC [email protected] 3 Mr. Santi Thongkorn CHIEF LEADER PQC [email protected] 118

4. Contact person 4.2 Supplier Contact Please submit TSPK within 30 Mar 2022 119

We are Good Teamwork with Continuous Improvement Spirit